Question

One root of the quadratic equation x^2 − 2x + m = 0 is 9. If the other root is n, what is n−m?

Answer 1

x^2-2x+m = (x-9)(x-n)
so,
-2 = -(n+9)
m = 9n

n = -7
m = -63

m+n = -70

Answer 2

thanks a lot steve