Factorise the expression q2 - 10q + 21
q2 -10q +21
middle term splitting 21= 7*3 which is equal to 7+3=10= -3=-7=-10
q2 -3q-7q+21
q(q-3) - 7(q-3)
(q-3) (q-7)
Factorise the expression q2 - 10q + 21
q2 -10q +21
middle term splitting 21= 7*3 which is equal to 7+3=10= -3=-7=-10
q2 -3q-7q+21
q(q-3) - 7(q-3)
(q-3) (q-7)