Determine the solutions to the quadratic equation -5x2 + 10x + 15 = 0.
-5x^2 + 10x + 15 = 0; -5(x - 3)(x +1) = 0; -5(x - 3) = 0; -5x + 15 = 0; -5x = -15; x = 3; (x + 1) = 0; x = -1 the solution set is {3, -1}
Question
Updated 6/28/2014 12:00:29 AM
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3
-5x^2 + 10x + 15 = 0;

-5(x - 3)(x +1) = 0;

-5(x - 3) = 0; -5x + 15 = 0; -5x = -15; x = 3;
(x + 1) = 0; x = -1

the solution set is {3, -1}

Questions asked by the same visitor
Solve by factoring. 8x2 - 10x - 25 = 0
Question
Updated 7/27/2014 3:08:33 PM
8x^2 - 10x - 25 = 0;
(2x - 5)(4x + 5) = 0;
2x - 5 = 0; x = 5/2;
4x + 5 = 0; x = -5/4
Solutions: x = -5/4 or x = 5/2
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