Verified answer

2(x²-40)=-x²+6(x+4)+1

2x²-80=-x²+6х+24+1

3x²-6х-105=0

x²-2х-35=0

D=4+140=144;√144=±12

x₁=(2-12)/2=-5

x₂=(2+12)/2=7

ответ:-5;7

2(x^2-40)=-x^2+ 6x+25

2x^2-80+x^2-6x -25=0

3x^2-6x - 105=0

D=36+1260=1296

x1=(6+36)/6=7

x2=(6-36)/6=-5

Ответ -5; 7