The reduced form of the algebraic expression 2(a2 − b2)(a + b) is
2(a2 − b2)(a + b)
We know that, a2 − b2 = (a + b)(a − b)
2(a2 − b2)(a + b) = 2(a+b)(a−b)a+b
So, the term (a+b) from both numerator and denominator should get canceled.
The shortest form is 2(a-b)