Question

Write the following cubes in expanded form:
(i) (2a-3b)
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Answer 1

Step-by-step explanation:

(i) (2a-3b)³

$(2a) {}^{3} - 3 \times( 2a )^{2} \times 3b + 3 \times 2a \times (3b )^{2} - {3b}^{3} \\ = 8a ^{3} - 36a ^{2} b + 54a {b}^{2} - 27 {b}^{3}$