Question

Solve 2a 2 - 3a - 2 = 0

{-1/2, 2}
{1/2, -2}
{}

Answer 1

The answer is {-1/2, 2}

Answer 2

Apply slip and slide
a^2-3a-4
(a-4)(a+1)
(a-2)(2a+1)

Find zeros
a-2=0
a=2

2a+1=0
2a=-1
a=-1/2

Final answer: {-1/2, 2}