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coolnikola957
@coolnikola957
August 2022
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Выполните действие : (b+2)²-2b(5b+4)
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maleevvladislav
(b+2)²-2b(5b+4)=0
b²+4b+4-10b²-8b=0
-9b²-4b+4=0
D = b2 - 4ac = (-4)2
- 4·(-9)·4 = 16 + 144 = 160
x1 =
4 - √160
= -2 + 2
------------- ---- ---√10
2·(-9) 9 9
x2 = 4 + √160 = -2 - 2
------------- ---- ---√10
2·(-9) 9 9
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Answers & Comments
b²+4b+4-10b²-8b=0
-9b²-4b+4=0
D = b2 - 4ac = (-4)2 - 4·(-9)·4 = 16 + 144 = 160
x1 = 4 - √160 = -2 + 2
------------- ---- ---√10
2·(-9) 9 9
x2 = 4 + √160 = -2 - 2
------------- ---- ---√10
2·(-9) 9 9