Question

expand the following

(2×-3y)^3

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Answer 1

Answer:

using identity: (x-y)³= x³-3x²y+3xy²-y³

$= ( {2x})^{3} - 3( {2x)}^{2} (3y) + \\ 3(2x) {(3y)}^{2} - 3 {y}^{2} \\ =8 {x}^{2} - 36 {x}^{2} y + 54x {y}^{2} - 9 {y}^{2}$