The correct factorization would be 2(x + 2)(x - 1).
In order to find this, start by taking out the GCF for the whole equation.
2x^2 + 2x - 4
2(x^2 + x - 2)
Now you can factor the parenthesis separately.
x^2 + x - 2
(x + 2)(x - 1)
Then just put all 3 parts together.
2(x + 2)(x - 1)
