SOLUTION: what is the answer step by step to the following quadratic equations ? x squared-4x-15=0 x squared+8x-33=0 x squared+5x+2=0 3xsquared-3x+6=0 Help would be great i need it

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Question 120707: what is the answer step by step to the following quadratic equations ?

x squared-4x-15=0
x squared+8x-33=0
x squared+5x+2=0
3xsquared-3x+6=0
Help would be great i need it bad
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
x^2-4x-15=0 using the quadratic equation:x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x=(4+-sqrt[-4^2-4*1*-15])/2*1
x=(4+-sqrt[16+60])/2
x=(4+-sqrt76)/2
x=(4+-8.72)/2
x=(4+8.72)/2
x=12.72/2
x=6.36 answer.
x=(4-8.72)/2
x=-4.72/2
x=-2.36 answer.
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x^2+8x-33=0
(x+11)(x-3)=0
x+11=0
x=-11 answer.
x-3=0
x=3 answer.
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I'LL LEAVE THE REST FOR YOU TO SOLVE.