Question

What is the product of (a - 1) and (2a + 2)?

Answer 1

2a²-2

Explanation:

(a-1)(2a+2)

a(2a+2)-1(2a+2)

2a²+2a-2a-2

2a²-2

Answer 2

Multiply each term in the first set of parenthesis by each term in the second set, then simply by combining like terms:

(a-1)(2a+2)

a*2a = 2a^2

a*2 = 2a

-1*2a = -2a

-1*2 = -2

Now combine:

2a^2 + 2a - 2a -2

= 2a^2 - 2