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medvedevsaveli
@medvedevsaveli
July 2022
1
6
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помогите
упростите выражение
(к-3)(к+3)-(2+к) в квадрате
и найдите его значение при к= -2,5
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Answers & Comments
ShirokovP
Verified answer
K^2 - 9 - (k^2 + 4k + 4) =
=
k^2
- 9 -
k^2
- 4k - 4 =
= - 4k - 13
k = - 2,5
4*2,5 - 13 = - 3
2 votes
Thanks 1
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Answers & Comments
Verified answer
K^2 - 9 - (k^2 + 4k + 4) == k^2 - 9 - k^2 - 4k - 4 =
= - 4k - 13
k = - 2,5
4*2,5 - 13 = - 3