Question

Expand each of the following, using suitable identities
(i) (x + 2y + 4z)^3 (ii) (2a - 3b)3
(iii) (-2a + 56 - 3c) (iv) (a/4-b/2+1)^2 (v) (p+1)^3 (vi) (x-2/3y)^3
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Answer 1

i)3(x+2y)(x+4z)(2y+4z)

Answer 2

Step-by-step explanation:

(2)

(2a - 3b)^3

= (2a)^3- (3b)^3 -3×2a×3b(2a-3b)

= 8a^3 - 27b^3 - 18 ab(2a-3b)

= 8a^3 - 27 b^3 - 36a^2b +54ab^2 ..ans