Question

a-b = 3
ab=5
a³-b³ = ?​

Answer 1

Answer:

$72$

Step-by-step explanation:

$(a - b)cube \: + 3ab(a + b) \\ 27 + 3 \times 5 \times 3 = 72$

Answer 2

${a}^{3} - {b}^{3} = {(a - b)}^{3} + 3ab(a - b) \\ = {3}^{3} + 3 \times 5(3) \\ = 27 + 3 \times 15 \\ = 27+ 45 \\ = 72$