Question

How do you factor and solve `x^2 – 9x = -20`?

Answer 1

x = 5 & 4

Explanation:

`x^2` - 9x + 20 = 0
or, `x^2` - 4x - 5x + 20 = 0
or, x (x - 4) - 5 (x - 4) = 0
or, (x - 4)(x - 5) = 0
or, x - 4 = 0, x - 5 = 0
or, x=4 & 5