Question

x^2-6x=7=0

Answer 1

i guess it's 6x -7 ?

Answer 2

let's assume it's x^2 -6x -7 =0
delta = 36 - 4*(-7) = 36 + 28 = 64

x1 = (6 + sqrt(64))/2 = (6 + 8)/2 = 14/2 = 7
x2 = (6 - 8)/2 = -2/2 = -1