SOLUTION: Good morning, I need to solve using the quadratic formula, 3x^2-4x-15=0 Thanks Gina

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Question 456617: Good morning,
I need to solve using the quadratic formula,
3x^2-4x-15=0
Thanks
Gina
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
3x^2-4x-15=0
a= 3 ,b= -4 ,c= -15

b^2-4ac= 16-180
b^2-4ac= 196
sqrt%28196%29=14
x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29
x1=%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F%282a%29
x1=(4+14)/6
x1= 3
x2=(4-14)/6
x2= -1.67