Question

I need a fast reply please​

Answer 1

`\implies {\blue {\boxed {\boxed {\purple {\sf { \:A. \:- 8 {b}^(4) + 10 {b}^(3) + 10b}}}}}}`

`\large\mathfrak{{\pmb{\underline{\red{Step-by-step\:explanation}}{\red{:}}}}}`

`(7b + 7 {b}^(3) - 6 {b}^(4) ) + (3 {b}^(3) + 3b - 2 {b}^(4) )`

➼
`\: 7b + 7 {b}^(3) - 6 {b}^(4) + 3 {b}^(3) + 3b - 2 {b}^(4)`

Combining like terms, we have

➼
`\: - 6 {b}^(4) - 2 {b}^(4) + 7 {b}^(3) + 3 {b}^(3) + 7b + 3b`

➼
`\: - 8 {b}^(4) + 10 {b}^(3) + 10b`

`\large\mathfrak{{\pmb{\underline{\orange{Mystique35 }}{\orange{❦}}}}}`