Question

PLEASE HELP!! Factor completely. (y^2x) - (y^x) - 20

Answer 1

$y^{2x} - y^{x} - 20$
$y^{2x} + 4y^{x} - 5y^{x} - 20$
$y^{x}(y^{x}) + y^{x}(4) - 5(y^{x}) - 5(4)$
$y^{x}(y^{x} + 4) - 5(y^{x} + 4)$
$(y^{x} - 5)(y^{x} + 4)$