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rinanov2014
@rinanov2014
July 2022
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а) (1+5х)(5х-1)=10х-1;
б)(2х+7)(7-2х)=49+7х.
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Answers & Comments
smardoyan1998
A)(
1+5х)(5х-1)=10х-1
5x-1+25x
²
-5x=10x-1
25x
²
-1=10x-1
25x
²
-10=0
25
²
=10
x
²
=0.4
x=+-
√0.4
б)
(2х+7)(7-2х)=49+7х
14x-4x²+49-14x=49+7x
49-4x²=49+7x
-4x²=7x
-4x²-7x=0
-x(4x+7)=0
4x+7=0 x=-7/4
-x=0 x=0
2 votes
Thanks 1
rinanov2014
спасибо огромное!!!!!!!
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Answers & Comments
5x-1+25x²-5x=10x-1
25x²-1=10x-1
25x²-10=0
25²=10
x²=0.4
x=+-√0.4
б)(2х+7)(7-2х)=49+7х
14x-4x²+49-14x=49+7x
49-4x²=49+7x
-4x²=7x
-4x²-7x=0
-x(4x+7)=0
4x+7=0 x=-7/4
-x=0 x=0