Question

Factor the expressions
1. -15x^2-21x
a.x(-15x-21) c.-3x(5x+7)
b.-15x(x+7) d.5x(x-3+7)

Answer 1

For -15 and -21, the common factor is -3. The common factor for x^2 and x is x. Hence the factorisation gives -3x(5x+7) as the answer.

Answer 2

Thank you im having trouble with this other one.
8x^2+12x-16
a.-2(-4x^2+12x-16) c.8(-2x-3)
b.8x^2+12x-6 d.-4(-2x^2-3x+4)

Answer 3

4(2x^2+3x - 4)

Answer 4

-4(-2x^2-3x+4)

Answer 5

Thank you. So x^2+14x+48 would=(x+6)(x+8).