Question

Simplify (8j3 + 3j2 + 7) – (3j3 – 7j2 – 7j – 12)

Answer 1

8j³+3j²+7-(3j³-7j²-7j-12)
8j³+3j²+7-3j³+7j²+7j+12
8j³-3j³+3j²+7j²+7j+7+12
5j³+10j²+7j+19

Answer 2

`5j^3 + 10j^2 +7j+19`

Explanation:

`(8j^3 + 3j^2 + 7) - (3j^3 - 7j^2 - 7j - 12)`

To simplify it we need to remove the parenthesis

WE multiply the negative sign inside the parenthesis'

`8j^3 + 3j^2 + 7- 3j^3 + 7j^2 + 7j + 12`

Now we combine like terms

`8j^3 - 3j^3 =5j^3`

`3j^2 +7j^2=10j^2`

`7+12=19`

Expression becomes

`5j^3 + 10j^2 +7j+ 19`