SOLUTION: 3x^2 + 12x = -5

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: 3x^2 + 12x = -5      Log On


   

Question 46512: 3x^2 + 12x = -5
Found 2 solutions by checkley71, Nate:
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
3x~2+12x+5=0 using [(-b+/-sqrtb~2-4ac)/2a] we get (-12+/-sqrt144-4*3*5)/6 or
(-12+/-sqrt144-60)/6 or (-12+/-sqrt84)/6 or (-12+/-2sqrt21)/6 or
(-6+/-sqrt21)/3

Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
3x^2 + 12x = -5
x^2 + 4x = -5/3
(x + 2)^2 = -5/3 + 12/3 = 7/3
x + 2 = +- sqrt(7/3)
x = -2 +- sqrt(7/3)
graph%28600%2C600%2C-10%2C10%2C-10%2C10%2C3x%5E2+%2B+12x%2C-5%29