Question

Which expression is equivalent to x+2+ [4x - x2+6x+8\x+4]

Answer 1

4x

Explanation:

correct on edge 2021

-RZA

Answer 2

`x+2+\left[4x-(x^2+6x+8)/(x+4)\right]=x+2+\left[4x-(x^2+4x+2x+8)/(x+4)\right]\\\\=x+2+4x-(x(x+4)+2(x+4))/(x+4)=5x+2-((x+2)(x+4))/(x+4)\\\\=5x+2-(x+2)=5x+2-x-2=4x`
Answer: 4x