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Mathematics 12 Online
OpenStudy (anonymous):

solve 8x^2+7x-15=-7

OpenStudy (anonymous):

8x^2+7x-8=0 then you do the longest equation ever, the quadratic equation

OpenStudy (anonymous):

I'm a staunch proponent for the quadratic equation. But if you want, this site will take the a, b, and c coefficients only AFTER you've set the equation equal to 0 as @momomalinka has done for you. http://www.mathsisfun.com/quadratic-equation-solver.html

OpenStudy (anonymous):

Edit: quadratic formula*

OpenStudy (anonymous):

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