Solve x2 + 10x = -21. x = 7 and x = 3 x = -7 and x = -3 x = -7 and x = 3 x = 7 and x = -3

asked May 18, 2017 15.0k views

2 votes

Solve x2 + 10x = -21.

x = 7 and x = 3
x = -7 and x = -3
x = -7 and x = 3
x = 7 and x = -3

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3 votes

Answer:

the 2nd one

Explanation:

Amr Salama answered May 19, 2017

8.2k points

5 votes

answer is x = -7 and x = -3

x2 + 10x = -21
x2 + 10x + 21 = 0
(x +3) (x +7) = 0

(x +3) = 0
and
(x + 7) = 0
so x = - 3 and x = -7

Holgac answered May 23, 2017

8.2k points

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