Question

Решить уравнение:
1) (x+2)²-(x-1)²=15
2) (x-1)²-(x-2)²=5

Answer 1

1) (x+2)²-(x-1)²=15
x²+4x+4-(x²-2x+1)=15
x²+4x+4-x²+2x-1=15
6x+3=15
6x=15-3
6x=12
x=2

2) (x-1)²-(x-2)²=5
x²-2x+1-(x²-4x+4)=5
x²-2x+1-x²+4x-4=5
2x-3=5
2x=5+3
2x=8
x=4

Answer 2

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