Question

If a = 6 and b = 2, what is the value of the following expression? (a + b)^3 - 3ab(a + b)

Answer 1

Pemdas
sub them

(6+2)³-3(6)(2)(6+2)
parenthasees simplify
(8)³-3(6)(2)(8)
exponents
512-3(6)(2)(8)
multiply
512-18(2)(8)
512-36(8)
512-288
244

Answer 2

The value would 223. all that needs to be done is substitute 6 for a and 3 for b.