Answer:
(-7 , 3)
Step-by-step explanation:
3x^2 + 12x = 63 //Subtract 63 on both sides.
3x^2 + 12x - 63 = 0 //Common factor 3.
3(x^2 + 4x - 21) = 0 //Divide both sides by 3.
(x^2 + 7x - 3x - 21) = 0
x(x + 7) - 3(x + 7) = 0
(x + 7) (x - 3) = 0
x = -7 and 3
Solution: (-7, 3)
