Question

Answer 1

`Q=3x^2(x+5)-5.(x+2x^2)-3x^3-5x^2+5(x+1)`

`Q=3x^3+15x^2-5x-10x^2-3x^3-5x^2+5x+5`

`Q=(3x^3-3x^3)+(15x^2-10x^2-5x^2)-(5x-5x)+5`

`Q=5`

Answer 2

`Q = 3x^3 + 15x^2 - 5x - 10x^2 - 3x^3 - 5x^2 + 5x + 5`

`= (3x^3 - 3x^3) + (15x^2 - 10x^2 - 5x^2) + (5x-5x) + 5`

`= 5`.

Answer 3

Q=3x²(x+5)-5.(x+2x²)-3x³-5x²+5(x+1)

   =3x³+15x²-5x-10x²-3x³-5x²+5x+5

   =3x³-3x³+15x²-10x²-5x²-5x+5x+5

   =5