Question

Решите уровнени 35+(5х-1)(5х+1)=(5х+2)в квадрате

Answer 1

$35+(5x-1)(5x+1)=(5x+2)^2\\35+25x^2-1=25x^2+20x+4\\25x^2-25x^2-20x=4-35+1\\-20x=-30\ /:(-20)\\x=1,5$