Question

solve for y.try factoring first,if factoring is not possible or difficult use quadratic formula,(y2  2isabovey -10y+23=0)

Answer 1

$y^2-10y+23=0\\ y^2-10y+25-2=0\\ (y-5)^2=2\\ |y-5|=\sqrt2\\ y-5=\sqrt 2 \vee y-5=-\sqrt2\\ y=5+\sqrt2 \vee y=5-\sqrt2$