Ex 2.4, 4 (iii) - Chapter 2 Class 9 Polynomials

Last updated at August 14, 2026 by

Ex 2.4, 4 (iii) - Expand (-2x + 3y + 2z)^2 using suitable identities - Ex 2.4

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Ex 2.4, 4 Expand each of the following, using suitable identities: (iii) (-2x + 3y + 2z)2 ( 2x + 3y + 2z)2 = (( 2x) + 3y + 2z)2 Using (a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ac Where a = -2x , b = 3y, c = 2z = (-2x)2 + (3y)2 + (2z)2 + 2(-2x) (3y) + 2 (3y) (2z) + 2 (2z) (-2x) = 4x2 + 9y2 + 4z2 12xy + 12yz 8xz

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