Question

Factorise x square-20x+112

Answer 1

x
$x { }^{2} - 20x + 112$
=
$x {}^{2} + 14x + 6x + 112$
=
$x(x + 14) + 6(x + 14)$
=
$(x + 14)(x + 6) = 0$
=
$x = - 14$
$x = - 6$