Question

Write the following cubes in expanded form:

(a) (3a – 4b)3​

Answer 1

Step-by-step explanation:

$(3a - 4b) {}^{3} \\ \\ = (3a) {}^{3} - (4b) {}^{3} - 3.3a.4b(3a - 4b) \\ \\ = 27a {}^{3 } - 64b {}^{3} - 36ab(3a - 4b) \\ \\ \\ formula \: \: \: \: - \: \: \: (x - y) {}^{3} = x {}^{3} - y {}^{3} - 3xy(x - y)$

Answer 2

a) (9a - 12b)

hope it helps u ✌