Question

 ét ô ét 

-3x.(x-5)+5.(x-1)+3x².1

Answer 1

\(-3x.\left(x-5\right)+5.\left(x-1\right)+3x^2.1\)

\(=-3x^2+15x+5x-5+3x^2\)

\(=\left(-3x^2+3x^2\right)+\left(15x+5x\right)-5\)

\(=20x-5\)

Answer 2

 `= -3x^2 + 15x + 5x - 5 + 3x^2`

`= 20x - 5`

`= 5(4x-1)`

Answer 3

\(=-3x^2+15x+5x-5+3x^2=20x-5\)