(x – 10)(x – 2) = -20

Answer 1

Rearrange that equation so there is zero on one side
x^2 -12x +20 = -20
x^2 -12x +40 = 0
Use the quadratic equation to solve that.
One root is
x = [12 + sqrt(-16)]/2
= 6 + 2i

Answer 2

6r · s · 4rt