Factorising expressions I

This task is about factorising algebraic expressions.

Question

a)  x2 + 9x + 18 can be factorised to 

    •   (x + 9)(x + 2)

    •   (x – 6)(x + 3)

    •   (x + 6)(x + 3)

    •   (x – 6)(x – 3)

Question

b)  x2 + 5x + 4 can be factorised to

    •   (x + 5)(x + 1)

    •   (x + 4)(x + 1)

    •   (x + 5)(x – 1)

    •   (x + 4)(x – 1)

Question

c)  x2 + x – 12 can be factorised to

    •   (x – 4)(x + 3)

    •   (x + 6)(x – 2)

    •   (x + 4)(x – 3)

    •   (x – 6)(x – 2)

Question

d)  x2 – 9x + 20 can be factorised to

    •   (x – 4)(x – 5)

    •   (x – 10)(x – 2)

    •   (x – 5)(x + 4)

    •   (x – 10)(x + 2)

Question

e)  x2 – 10x + 21 can be factorised to

    •   (x + 7)(x – 3)

    •   (x – 7)(x + 3)

    •   (x + 7)(x + 3)

    •   (x – 7)(x –3)

Question

f)  x2 – 2x – 24 can be factorised to

    •   (x + 4)(x - 6)

    •   (x – 4)(x + 6)

    •   (x – 6)(x – 4)

    •   (x + 4)(x + 6)