Question

a) 5(3x+6)(2x-4)=

b) (x²+x+1)(x²-2x-3)=

c) (-6a-2y)(a+4)=

d) (7x+2)(-3x-4)=

Answer 1

a) 5(3x+6)(2x-4)=5(6x²-12x+12x-24)=5(6x²-24)=30x²-120

b) (x²+x+1)(x²-2x-3)=x⁴-2x³-3x²+x³-2x²-3x+x²-2x-3=x⁴-x³-5x²-5x-3

c) (-6a-2y)(a+4)=-6a²-24a-2ay-8y

d) (7x+2)(-3x-4)=-21x²-28x-6x-8