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valentina_108 [34]
3 years ago
5

Can some one help please help me

English
1 answer:
Jlenok [28]3 years ago
4 0

Answer:

7

Explanation:

equation: x(x-2)=2x+21

find x:  x^{2} -4x -21 = 0

(-b +/- \sqrt{b^{2} - 4ac }) /2a

(4 +/- \sqrt{(-4)^{2} - 4(1)(-21)} ) /2(1)

(4 +/- 10) /2

= -3 and 7

-3 obviously does not work, but 7 does

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