Question

0=x^2-20 can you solve using square root formula? Then by using quadratic formula?

Answer 1

Sqrt(x^2) = sqrt(20)

x = +2sqrt(5)
x = -2sqrt(5)

x1 = (- 0 + sqrt(0^2 - 4*1*(-20))) / (2*1) 
X2 = (-0 - sqrt(0^2 - 4*1*(-20))) / (2*1)