Question

решите уравнение 3(-0,5+2х^2-(х+2)(2х-4))=5х-20

Answer 1

3(-0,5+2х^2-(x+2)(2x-4))=5x-20
3(-0.5+2x^2-(2x^2-8))=5x-20
3(-0.5+8)=5x-20
3*7.5=5x-20
5x-20=22.5
5x=42.5
x=42.5/5
x=8.5