Решите:

(x-4)²+(x+9)²=2x²

-2х²+х+7=-х²+5х+(-2-х²)

(х+10)²=(5-х)²

4х²+7=7+24х

1.(x-4)^2+(x+9)^2=2x^2

x^2-4x+4+x^2+18x+81=2x^2

14X+85=0

x=85/14

2.-2x^2+x+7=-x^2+5x-2-x^2

x+7=5x-2

4x=9

x=9/4

3.x^2+20x+100=25-10x+x^2

30x=-75

x=5/2

4.4x^2-24x=0

4x(x-6)=0

x=0 або x=6