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

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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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

asked
User Fuzz Evans
by
7.9k points

2 Answers

3 votes

Answer:

the 2nd one

Explanation:

answered
User Amr Salama
by
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
answered
User Holgac
by
8.2k points
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