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SmilingWorld
@SmilingWorld
July 2022
2
16
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x^2-28x+195=0
a=1
b=(-28)
c=195
D= b^2-4ac=(-x^2)^2
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Answers & Comments
Akula17
Сказанное тобой а b c - верно , теперь решаем дискриминант.
D=b^2 - 4ac= ( - 28)^2 - 4 * 1 * 195= 784 - 780=4
√D=2
x1= - b + √D / 2a = 28+2 / 2 = 15
x2= - b - √D / 2a = 28 - 2 / 2 = 13
Ответ:15;13.
2 votes
Thanks 3
SmilingWorld
Огромное спасибо)
veronikasirota
X^2-28x+195=0
можно решить по теореме Виета
x1 * x2 =с
x1 + x2 = -b
x1 * x2 = 195 отсюда следует, что
x1 + x2 = 28
x1 = 13, x2 = 15
0 votes
Thanks 0
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Answers & Comments
D=b^2 - 4ac= ( - 28)^2 - 4 * 1 * 195= 784 - 780=4
√D=2
x1= - b + √D / 2a = 28+2 / 2 = 15
x2= - b - √D / 2a = 28 - 2 / 2 = 13
Ответ:15;13.
можно решить по теореме Виета
x1 * x2 =с
x1 + x2 = -b
x1 * x2 = 195 отсюда следует, что
x1 + x2 = 28
x1 = 13, x2 = 15