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Amelie13
@Amelie13
June 2022
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Пожалуйста, решите уравнение СРОЧНО!!!
(5х-1)^2-4(x-5)^2=(3x+7)(3x-7)
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Flash3146
(5х-1)^2-4(x-5)^2=(3x+7)(3x-7)
25x²-10x+1-4(x²-10x+25)=9x²-49
25x²-10x+1-4x²+40x-100=9x²-49
25x²-10x-4x²+40x-9x²=-49+100-1
12x²+30x=50
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Thanks 1
a9872056695
25x^2-10x+1-4(x^2-10x+25)=(3x)^2-7^2
25x^2-10x+1-4x^2+40x-100=9x^2-49
12x^2+30x-50=0
D=30*30-4*12*50=-1500
x=-b/2a=-30/24=-1.25
3 votes
Thanks 1
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Answers & Comments
25x²-10x+1-4(x²-10x+25)=9x²-49
25x²-10x+1-4x²+40x-100=9x²-49
25x²-10x-4x²+40x-9x²=-49+100-1
12x²+30x=50
25x^2-10x+1-4x^2+40x-100=9x^2-49
12x^2+30x-50=0
D=30*30-4*12*50=-1500
x=-b/2a=-30/24=-1.25