Homework Help: Math

Posted by B.B. on Friday, September 18, 2009 at 6:55am.

I am stumped could someone please explain this problem?
Give the solutions to the following quadratic equation by examining the graph of the related quadratic function:
Graph: y=x^2+2x-15
Equation: x^2+2x-15=0
Thanks so much.

Math - Reiny, Friday, September 18, 2009 at 7:33am
algebraic solution:
(x+5)(x-3) = 0
so x = -5 or x = 3

When you graphed it, did you not get a parabola that opened upwards and crossed the x-axis at -5 and 3 ?
Math - drwls, Friday, September 18, 2009 at 7:34am
We can't draw graphs for you; you can and should do that yourself.
Since the equation can be factored to (x+5)(x-3) = 0,
the solutions are x=-5 and +3.

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