Question

The solution to x2 + 18x − 40 = 0 is {-20, 1}.
Answer True False

Answer 1

@abcabc

Answer 2

Assuming that's an exponent after the "x":
Substitute in the values for the variable:

x2 + 18x − 40 = 0 is {-20, 1}.

(-20)(-20) + 18(-20) - 40
400 - 360 - 40

Yup, that's zero, so it's true.