Question

If using the method of completing the square to solve the quadratic equation X^2-10x+21=0

Answer 1

x^2 - 10x + 21 = 0

Add both sides 4

x^2 - 10x + 21 + 4 = 0 + 4

x^2 - 10x + 25 = 4

( x - 5 )^2 = 4

___________________

1 ) x - 5 = 2 ==》 x = 7

2 ) x - 5 = - 2 ==》 x = 3

Answer 2

X=1/10 (X^2+21)

Hope this helped!