Question

5)y^2-2y-8=2y-8
6) 3u^2+7=6u+7

Answer 1

$3u^{2} +7=6u+7 \ 3u^{2} +7-6u-7=0 \ 3u^{2} -6u=0 \ u(3u-6)=0 \ left { {{u=0} atop {u=2}} right.$$1) y^{2} -2y-8=2y-8 \ y^{2} -2y-8-2y+8=0 \ y^{2} -4y=0 \ y(y-4)=0 \ left { {{y=0} atop {y=4}} right.$