SOLUTION: Please help me solve this equation by factoring:{{{5x^2+8x-21=0}}}

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Question 33809: Please help me solve this equation by factoring:5x%5E2%2B8x-21=0
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Solve by factoring:
5x%5E2%2B8x-21+=+0 Factor.
%285x+-7%29%28x%2B3%29+=+0 Apply the zero products principle.
5x-7+=+0 and/or x%2B3+=+0
If 5x-7+=+0 then 5x+=+7 and x+=+7%2F5
If x%2B3+=+0 then x+=+-3
The roots are:
x+=+7%2F5
x+=+-3