Question

Complete the square to solve the following quadratic equation: x2−6x−20=20
.(1 point)
Responses

x=−10
, x=4
x equals negative 10 , x equals 4

x=52
, x=−46
x equals 52 , x equals negative 46

x=10
, x=−4
x equals 10 , x equals negative 4

x=3+210−−√, 3−210−−√

Answer 1

x^2 − 6x − 20 = 20
=> x^2 − 6x − 40 = 0
=> x^2 − 6x = 40
Add 9: (x − 3)^2 = 49
x − 3 = ±7
x = 10 or x = −4

So the correct choice is x = 10, x = −4.