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bunakovaa
@bunakovaa
June 2022
2
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помогите решить уравнение (-2х+1)(-2х-7)=0
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FasTik2015
1)4х ^2-28x+49=4x^2-4x+1
-28x+49=-4x+1
-28x+4x=1-49
-24x=-48
x=2
2)x^2-20x+100=x^2+6x+9
-20x+100=6x+9
-20x-6x=9-100
-26x=-91
x=3,5
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art00
Хотя бы одно из множителей должно быть равно 0Т.е.-2х+1=0-2х=-1Х=1/2-2х-7=0-2х=7Х=-3,5Два корня
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Answers & Comments
-28x+49=-4x+1
-28x+4x=1-49
-24x=-48
x=2
2)x^2-20x+100=x^2+6x+9
-20x+100=6x+9
-20x-6x=9-100
-26x=-91
x=3,5