Answer
See answers below
Work Step by Step
$a) (x+1)(x-5)=0$
$x+1=0$ or $x-5=0$
$x=-1$ or $x=5$
$b) (2x+3)(x-4)=0$
$2x+3=0$ or $x-4=0$
$x=-\frac{3}{2}$ or $x=4$
$c) (2y+1)(y+14)=0$
$2y+1=0$ or $y+14=0$
$y=-\frac{1}{2}$ or $y=-14$
$d) (7n-2)(5n-4)=0$
$7n-2=0$ or $5n-4=0$
$x=\frac{2}{7}$ or $n=\frac{4}{5}$