Question

(0.4k3 – 2.5k) – (2.4k3 + 3k2 – 1.2k) =

–2.8k3 – 3k2 – 3.7k
–2.8k3 + 3k2 – 1.3k
–2k3 – 3k2 – 1.3k
–2k3 + 3k2 – 3.7k

Answer 1

its –2k3 – 3k2 – 1.3k that's what it is for sure

Answer 2

ANSWER
The correct answer is



`- 2{k}^(3) - 3 {k}^(2) - 1.3k`


Step-by-step explanation

The given expression is

`(0.4 {k}^(3) - 2.5k) - (2.4 {k}^(3) + 3 {k}^(2) - 1.2k)`

We expand the brackets to obtain,



`0.4 {k}^(3) - 2.5k- 2.4 {k}^(3) - 3 {k}^(2) + 1.2k`

We now group like terms to obtain,


`0.4 {k}^(3) - 2.4 {k}^(3) - 3 {k}^(2) + 1.2k- 2.5k`

We simplify further to get,



`- 2.0 {k}^(3) - 3 {k}^(2) - 1.3k`

This is the same as,


`- 2{k}^(3) - 3 {k}^(2) - 1.3k`


Therefore the correct answer is option C.