Решите уравнение (5х-1)(х+2)+3(х-4)(х+4)=2(2х+3)²-8

Question

Решите уравнение (5х-1)(х+2)+3(х-4)(х+4)=2(2х+3)²-8

Answer 1

(5х-1)(х+2)+3(х-4)(х+4)=2(2х+3)²-8
5х²-х+10х-2+3(х²-4х+4х-16)=2(4х²+6х+9)-8
5х²-х+10х-2+3(х²-16)=8х²+12х+18-8
5х²-х+10х-2+3х²-48=8х²+12х+18-8
5х²-х+10х+3х²-8х²-12х=18-8+2+48
-3х=60
х=-20