Решите:(x-4)²+(x+9)²=2x²-2х²+х+7=-х²+5х+(-2-х²)(х+10)²=(5-х)²4х²+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