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Solve the following quadratic equation by completing the square. If necessary, round to the nearest tenth. x2 + 16x = -15
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Solve the following quadratic equation by completing the square. If necessary, round to the nearest tenth. x2 + 16x = -15

User AlQuemist
by
8.0k points

1 Answer

2 votes

Answer:

x=1, x=15

Explanation:


x^2+16x=-15\\x^2+16x+(8)^2=-15+8^2\\x^2+16x+64=-15+64\\(x+8)^2=49\\√((x+8)^2=49) \\x+8=+-7\\x=8-7 = 1\\x=8+7=15

User Weigreen
by
7.6k points
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