Question

решите уравнение 2(х2 - 40)=-х2+6(х+4)+1

Answer 1

2x2-80=-x2+6x+24+1
3x2-6x-105=0   /3
x2-2x-35=0
(x+5)(x-7)=0
x=-5 x=7

Answer 2

2х^2-80=-$x^{2}$+6x+24+1
2$x^{2}$+$x^{2}$-80-25-6x=0
3$x^{2}$-6x-105=0
дискриминант=36-4*3*(-105)=1296
х1=$frac{6-36}{6}$=-5
х2=$frac{6+36}{6}$=7