Answer:

x = -7

x = -4

Step-by-step explanation:

3x^2 + 33x + 84 = 0

252x^2 = 12x . 21x

33x = 12x + 21x

3x^2 + 12x + 21x + 84 = 0

(3x^2 + 12x) + (21x + 84) = 0

3x(x + 4) + 21(x + 12) = 0

3x + 21 = 0

x + 4 =0

3x/3 + 21/3 =0

x + 7 = 0

x = -7

x = -4

pa brainliest please