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Solving a Quadratic Equation

ACTMAT-TETACG

Which of the following is a solution to:

$$ { x }^{ 2 }+8x=15 $$

A

$-3$

B

$5$

C

$ -4-\sqrt { 14 } $

D

$ -4+\sqrt { 31 } $

E

$ 4+\sqrt { 14 } $