Posted by Julia on Wednesday, March 6, 2013 at 10:27pm.
In google type:
quadratic equation online
When you see list of results click on:
Free Online Quadratic Equation Solver:Solve by Quadratic Formula
When page be open in rectangle type:
and click option: solve it
You will see solution step-by step
I assume you meant
solve 16x^2+56x-120=0 , you must have an "equation" to solve for it.
divide by 8
2x^2 + 7x - 15 = 0
(2x-3)(x+5) = 0
x = 3/2 or x = -5
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