Question

.

Answer 1

We need to make the equation equal to 0

move 21 to the other side

\(x^2+4x-21=0\)

Factors of -21 that add up to 4?

Answer 2

(x + 7)(x - 3)

x + 7 = 0

x = ?

x - 3 = 0

x = ?

Answer 3

@Mehek14 , you need to read the entire question; he was supposed to use the method of "completing the square". Although you made it to the correct answers, if @qwertykingGHLPO were being graded on process, you used the wrong method.
Luckily, it appears that only an answer was needed here.