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

Algebra ->  Algebra  -> Polynomials-and-rational-expressions -> SOLUTION: Please help me solve this equation by factoring:{{{5x^2+8x-21=0}}}      Log On

Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!
Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

   

Question 33809: Please help me solve this equation by factoring:5x%5E2%2B8x-21=0
Answer by Earlsdon(6103) 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