3 years ago

Solve for x: x2 + 8x = -1

Mathematics

1 answer:

olga nikolaevna [1]3 years ago

7 0

$x^2+8x=-1\\
x^2+8x+16-16=-1\\
(x+4)^2=15\\
x+4=\sqrt{15} \vee x+4=-\sqrt{15}\\
x=-4+\sqrt{15} \vee x=-4-\sqrt{15}$

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