Question

B

Answer 1

Answer:

No. He wrong in the 1st step . The value of x is -7 and 0 .

Step-by-step explanation:

In order to solve the equation, you have to make the equation equals to zero by substracting 12 to both sides :

${x}^{2} + 7x + 12 = 12$

${x}^{2} + 7x + 12 - 12 = 12 - 12$

${x}^{2} + 7x = 0$

Next, you have to factorize and solve it :

$x(x + 7) = 0$

$x = 0$

$x + 7 = 0 \\ x = - 7$