Cpoчно! Решите уравнения: 1) 8(x-10)^2-11(x+5)^2=-3x^2-170x+1600 2)2,5(4+х)^2+7(5-x)(5+x)=295-4,5x^2. Created by kamilla041. algebra-ru

Cpoчно! Решите уравнения: 1) 8(x-10)^2-11(x+5)^2=-3x^2-170x+1600 2)2,5(4+х)^2+7(...

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Cpoчно!
Решите уравнения:
1) 8(x-10)^2-11(x+5)^2=-3x^2-170x+1600
2)2,5(4+х)^2+7(5-x)(5+x)=295-4,5x^2

Verified answer

2)
2.5(4+х)^2+7(5-x)(5+x)=295-4.5x^2
2.5(16+8x+x²)+7(25-x²)=295-4.5x²
40+20x+2.5x²+175-7x²=295-4.5x²
20x=80
x=4

1)
8(x-10)^2-11(x+5)^2=-3x^2-170x+1600
8(x²-20x+100)-11(x²+10x+25)=-3x²-170x+1600
-3x²-160x+800-110x-275=-3x²-170x+1600
-270x+525=-170x+1600
100x=-1075
x=-10.75

37 votes Thanks 61

sedinalana

Verified answer

1
8x²-160x+800-11x²-110x-275+3x²+170x-1600=0
-100x=1075
x=-10,75
2
40+20x+2,5x²+175-7x²-295+4,5x²=0
20x=80
x=4

31 votes Thanks 59

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