Question

Is this correct?

Simplify 4k^3(3k^3 – 5k^2 – k + 1)
answer... 12k^6 - 20k^5 - 4k^4 + 4k^3 ?

Answer 1

Yes it is!

Answer 2

no it's not

Answer 3

the question asks you to simplify it, not expand it

Answer 4

here's a hint: (k-1)(k-1)(3k+1) = (k^2 -2k +1)(3k+1) = 3k^3 -5k^2 -k +1

Answer 5

so your answer is actually: 4k^3(3k^3 – 5k^2 – k + 1) = 4k^3(k-1)^2(3k+1)

Answer 6

thats not even one of my options o.O

Answer 7

well that's what it simplifies to. The thing in brackets is a cubic which you can factor. Simplifying is expressing something in its most compact form...

Answer 8

hm okay thanks :)