Question

Factorise: x²– 4x – 21 using middle term splitting method​

Answer 1

x^2 + 3x -7x - 21

x(x + 3) - 7(x + 3)

(x - 7) (x + 3)

Answer 2

Answer:

x²-4x-21

=x² -7x +3x -21

=x(x-7) + 3(x-7)

= (x+3) (x-7)