*50pts* timed test , will make brainliest simplify the following polynomial expression. (5x^4-9x^3+7x-1)+(-8x^4+4x^2-3x++5x -1)(2x-7)

8x4 + 2x2 - 9x - 6
reformatting the input :

changes made to your input should not affect the solution:

(1): "x4" was replaced by "x^4". 2 more similar replacement(s).

step by step solution :

step 1 :

equation at the end of step 1 :

•(x4))+(2•(+1)+((5x4-9x)-7)
step 2 :

equation at the end of step 2 :

•(x4))+2x2)+1)+(5x4-9x-7)
step 3 :

equation at the end of step 3 :

((3x4 + 2x2) + 1) + (5x4 - 9x - 7)
step 4 :

checking for a perfect cube :

4.1 8x4+2x2-9x-6 is not a perfect cube

trying to factor by pulling out :

4.2 factoring: 8x4+2x2-9x-6

thoughtfully split the expression at hand into groups, each group having two terms :

group 1: -9x-6
group 2: 8x4+2x2

pull out from each group separately :

group 1: (3x+2) • (-3)
group 2: (4x2+1) • (2x2)