Question

Solve the equation by graphing: 3x2 + 9x = 12.
\
A. {-4, 1}
B. {-6, 2}
C. {-3, 4}
D. No solution

Answer 1

A

Answer 2

A i think

Answer 3

rewrite as 3x^2+9x-12=0
divide through by 3 ( common)
+> x^2+3x-4=0
Can solve by either factorization:
(x-1)(x+4)=0;
hence x =-4 or x =1.

You can also use the formula:
ax^2+bx+c=0
+> x= [-b (plus or minus)sqrt(b^2-4*a*c)]/{2*a}

thus the previous equation yields:
x = -24/6 or 6/6
hence x=-4, or x=1

Answer 4

(x+4)(x-1)= 0 => x = -4 or 1

Answer 5

3x^2 + 9x - 12 = 0
3x^2 -3x + 12x - 12 = 0
3x(x-1) -12(x-1) = 0
3(x+4)(x-1) = 0

Answer 6

I acknowledge that I made a mistake. I was in the middle of correcting it however.

Answer 7

@mas_gh90