Question

 (x3 - x2 + 2x – 1)(5 – x) =

Answer 1

`= (2x-1)(5-x)`

`= 10x - 5 - 2x^2 - x`

`= -2x^2 + 9x - 5`

Answer 2

=5\(\left(2x-1\right)-x\left(2x-1\right)\)

=\(10x-5-2x^2+1\)

=\(10x-2x^2-4\)

Answer 3

\(=5x-5x+10x-5-x^2+x^2-2x^2+x=\left(5x-5x+10x+x\right)+\left(-x^2+x^2-2x^2\right)-5=11x-2x^2-5\)

Answer 4

\(=\left(2x-1\right)\left(5-x\right)\)

\(=10x-2x^2-5+5x\)

\(=-2x^2+15x-5\)