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)

  • 4

q2 - 7q - 3q + 21

q(q -7) -3(q - 7)

(q - 3)(q - 7)

  • 1

q2 - 10 q + 21  (by splitting -10q)

q2 - 3q - 7q + 21

q(q -3) -7(q - 3)

(q - 3)(q - 7)

  • 4
What are you looking for?