Question

Решите уравнение:
(3х-1)^2-8(х+1)^2=(х+2)(х-2)

Answer 1

9х²-6х+1-8(х²+2х+1)=х²-4
9х²-6х+1-8х²-16х-8=х²-4
х²-22х-7=х²-4
х²-х²-22х=-4+7
-22х=3
22х=-3
х=-3/22