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

Solution for (a-1)(2a+2)= equation:

Simplifying
(a + -1)(2a + 2) = 0

Reorder the terms:
(-1 + a)(2a + 2) = 0

Reorder the terms:
(-1 + a)(2 + 2a) = 0

Multiply (-1 + a) * (2 + 2a)
(-1(2 + 2a) + a(2 + 2a)) = 0
((2 * -1 + 2a * -1) + a(2 + 2a)) = 0
((-2 + -2a) + a(2 + 2a)) = 0
(-2 + -2a + (2 * a + 2a * a)) = 0
(-2 + -2a + (2a + 2a2)) = 0

Combine like terms: -2a + 2a = 0
(-2 + 0 + 2a2) = 0
(-2 + 2a2) = 0

Solving
-2 + 2a2 = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + 2a2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 2a2 = 0 + 2
2a2 = 0 + 2

Combine like terms: 0 + 2 = 2
2a2 = 2

Divide each side by '2'.
a2 = 1

Simplifying
a2 = 1

Take the square root of each side:
a = {-1, 1}