Question

Expand (i)(x-2y+3z)^2
(ii)(2x-y)^3

Answer 1

Use the algebraic identities

Answer 2

Answer:

i)x^2(-2y)^2+3z^2+2×X×-2y+2×-2y×3z+2×3z×x

x^2-4y^2+9z^2-4xy-12yz+6xz

ii) 2x^3 -y^3-3×2X×y(2x-y)

8x^3-y^3-12x^2y-6xy^2

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