Question

Find x from the quadratic formula

Answer 1

I think you mean, find the equation from the quadratic formula solution.

10x^2 -x +9 = 0
a=10  b=-1  c=9

x = --1 +-sq root(1 - 4*10*9) / 2*10

x = 1 +-sq root(1 -360) / 20

x = 1 +-sq root( -359) / 20