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Example 12 Factorise the following (i) 21x2y3 27x3y2 (ii) a3 – 4a2 12 – 3a (iii) 4x2 – x 25 (iv) 2 –9 9 y (v) x4 – 256 Solution (i) 21x2y3 27x3y2 = 3 × 7 × x × x × y × y × y 3 × 3 × 3 × x × x × x × y × y = 3 × x × x × y × y (7y 9x) (Using ab ac = a (b c)) = 3x2y2 (7y 9x) (ii) a3 – 4a2 12 – 3a = a2 (a – 4) – 3a 12 = a2 (a – 4Algebraic Identity means that the lefthand side of the equation is identical to the righthand side of the equation, and for all values of the variables Algebra Formulas for Class 9 (x9 y 3)/(x7 y 8) so that the answer has no negative exponents Expand the logarithm log x 2 y 3 zD) x=8 and y=0 Answer b Clarification If two complex numbers are equal, then corresponding parts are equal ie real parts of both are equal and imaginary parts of both are equal

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(x y)^3 identity class 9

(x y)^3 identity class 9-Class 9 RD Sharma Solutions Chapter 4 Algebraic Identities Ex 43 Question 1 Find the cube of each of the following binomial expressions Solution Question 2 If a b = 10 and ab = 21, find the value of a 3 b 3 Solution a b = 10, ab = 21 An algebraic identity is an equality that holds for any values of its variables For example, the identity ( x y) 2 = x 2 2 x y y 2 (xy)^2 = x^2 2xy y^2 (x y)2 = x2 2xyy2 holds for all values of x x x and y y y Since an identity holds for all values of its variables, it is possible to substitute instances of one side of the

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 Find the value of the polynomial 3x3 – 4x2 7x – 5, when x = 3 and also when x = 3 asked in Class IX Maths by saurav24 Expert ( 14k points) polynomialsYou are the right place to get all information about Algebraic Expressions and Identities Class 8 mathsFree download NCERT Solutions for Class 9 Maths Chapter 2 Exercise 21, 22, 23, 24 and 25 of Polynomials in PDF form Online sols & practice questions

The purpose of this unit is to think deeply and critically about personal identity by analyzing characters in texts and making connections to themselves This unit introduces students to literary analysis, promotes creative writing, and supports structured conversations Teachers are encouraged to start of the school year with the 9th grade5 Classify the following as linear, quadratic and cubic polynomials ∵ The degree of x 2 x is 2 ∴ It is a quadratic polynomial ∵ The degree of x – x 3 is 3 ∴ It is a cubic polynomial ∵ The degree of y y 2 4 is 2 ∴ It is a quadratic polynomial ∵ The degree of 1 x is 1(x1) (x2) = x 2 3x 2

 3 If x y = 9 and xy= 14, find x 2 – y 2 4 If 3x 2y = 12 and xy = 6, find the value of 9x 2 4y 2 Class 8 Maths Algebraic Expressions and Identities Long Answer Type Questions 1 Given (x 2 y 2) = 74 and xy = 35, find the value of x y and x – y 2 If x = 4, find the value ofIn mathematics, For the multiplicative inverse of a real number, divide 1 by the number For example, the reciprocal of 5 is one fifth (1/5 or 02), and the reciprocal of 025 is 1 Ex 25, 9 Verify (i) x3 y3 = (x y) (x2 – xy y2) Ex 25, 9 Verify (ii) x3 y3 = (x y) (x2 xy y2) LHS x3 y3 We know (x y)3 = x3 y3 3xy (x y

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Here, Right hand side = Left hand side which means that (a3) (a3) is an identity Using Activity Method In this method, the algebraic identity is verified geometrically by taking different values of a x and yBecause an identity stays the same for every value of its variables, one can substitute the terms of one side of the equation, with the terms of the other side, as shown in the example above, where we replaced an instance of (xy) 2 with the instance of x 2 2xy y Students can access the NCERT MCQ Questions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities with Answers Pdf free download aids in your exam preparation and you can get a good hold of the chapter

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Example 22 Write The Following Cubes In Expanded Form Examples

  Algebraic Identities Polynomials, Class 9, Mathematics EduRev Notes is made by best teachers of Class 9 This document is highly rated by Class 9 students and has been viewed timesSelina Concise Mathematics Part I Solutions for Class 9 Mathematics ICSE, 4 Expansion All the solutions of Expansion Mathematics explained in detail by experts to help students prepare for their ICSE examsWe already have an identity for (x y) 3 So, let's try to derive the identity x 3 y 3 using the identity for (x y) 3 Let's first try to understand this geometrically Let's join our cubes as shown above We arranged both cubes in such a way to convert it into a cube as shown above

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Important Questions For Cbse Class 9 Maths Chapter 2 Polynomials

Algebraic Expression Definition An algebraic expression is a mathematical term that consists of variables and constants along with mathematical operators (subtraction, addition, multiplication, etc) Example 8x – , 5x – 6y 30 etc Quick Note Algebraic expressions shouldn't be confused with algebraic equationsThe notation f X → Y means that f is a function from X to Y X is called the domain of f and Y is called the codomain of f Given an element x ∈ X, there is a unique element y in Y that is related to x The unique element y to which f relates x is denoted by f (x) and is called f of x, or the value of f at x, or the image of x under fPolynomial Identities When we have a sum (difference) of two or three numbers to power of 2 or 3 and we need to remove the brackets we use polynomial identities (short multiplication formulas) (x y) 2 = x 2 2xy y 2 (x y) 2 = x 2 2xy y 2 Example 1 If x = 10, y = 5a (10 5a) 2 = 10 2 2·10·5a (5a) 2 = 100 100a 25a 2

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Example 2x² 1, x – 3, –3/2(y) x Trinomial A polynomial having three terms is known as trinomial Example x² 2x 2 Classification of Polynomials Based on the Degrees of Its Variable Linear polynomial A polynomial having degree one is known as linear polynomial Solution (3x– 4y) 3 is of the form Identity VII where a = 3x and b = 4y So we have, (3x – 4y) 3 = (3x) 3 – (4y) 3 – 3(3x)(4y)(3x – 4y) = 27x 3 – 64y 3 – 108x 2 y 144xy 2 Example 5 Factorize (x 3 8y 3 27z 3 – 18xyz) using standard algebraic identities Solution (x 3 8y 3 27z 3 – 18xyz)is of the form Identity= (x y)(x 2 y 2 2xy x 2 xy y 2) using identity, (a b) 2 = a 2 b 2 2 ab) = (x y) (3xy) Hence, one of the factor of given polynomial is 3xy Question 18 The coefficient of x in the expansion of (x 3) 3 is (a) 1 (b) 9 (c) 18 (d) 27 Solution (d) Now, (x 3) 3 = x 3 3 3 3x (3)(x 3) using identity, (a b) 3 = a 3 b 3

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