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Alja [10]
4 years ago
9

Solve each quadratic equation. Show your work 15. x2 + 3x = 10

Mathematics
2 answers:
Margarita [4]4 years ago
5 0
X^2+3x-10=0
(x+5)(x-2)=0
x=-5 or x=2
Hope this helps. 
OLEGan [10]4 years ago
4 0
X² + 3x = 10

Convert to standard form.
x² + 3x - 10 = 0

factor x² = x * x
factor -10 = 5 * -2

(x + 5) (x - 2) = 0
x(x -2) + 5(x-2) = 0
x² - 2x + 5x - 10 = 0
x² + 3x - 10 = 0

x + 5 = 0               x² + 3x = 10
x = -5               -5² + 3(-5) = 10
                              25 - 15 = 10
                                     10 = 10

x - 2 = 0            x² + 3x = 10
x = 2               2² + 3(2) = 10
                             4 + 6 = 10
                                 10 = 10
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