Question

Решите уравнения 1)x^4-10x^2-25=0 2) |3+2|=1

Answer 1

x²=t
t²-10t-25=0
(t-1)²=0
t=1
x²=1
x1=1
x2=-1

I2x+3I=1

1)2x+3=1
2x=1-3
x1=-1

2)2x+3=-1
2x==-1-3
2x=-4
x2=-2