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mishan1
@mishan1
July 2022
1
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решите пржалста 4x²+21x+5=0
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зіночка
4x²+21x+5=0
Найдем дискриминант:
D = b2 - 4ac = 212 - 4·4·5 = 441 - 80 = 361
x1 =
-21 - √361 /
2·4=
-40/8
= -5
x2 =
-21 + √361 /
2·4
=
-2/8
= -0.25
7 votes
Thanks 4
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Answers & Comments
Найдем дискриминант:
D = b2 - 4ac = 212 - 4·4·5 = 441 - 80 = 361
x1 = -21 - √361 / 2·4= -40/8 = -5
x2 = -21 + √361 / 2·4 = -2/8 = -0.25