Question

plzz solve 2 by quadratic equation by factorisation

Answer 1

Got it or not if still some doubt ask

Answer 2

${x}^{2} + x - 20 = 0$
$= > {x}^{2} + 5x - 4x - 20 = 0$
$= > (x + 5)(x - 4) = 0$
$so... \\ (x + 5) = 0 \\ = > x = - 5 \\ or... \\ (x - 4) = 0 \\ = > x = 4$