Question

WILL MEDAL help me if please

Answer 1

1. Use the FOIL method (x+9)(x+9)
First, outer, inner, last

`x^(2) +9x+9x+81`
Add your like terms

`x^(2) +18x+81`

2. When you add or subtract polynomials you add or subtract the like terms and then put them in order from largest to smallest exponents.

3.
`-5x(5 x^(3) +10 x^(2) -6x+3)`

4. Since it is the perimeter, we add the 3 together.

`(2 x^(2) +4x-3)+(-3 x^(2) -3)+(5x+19)`
Add the like terms together:

`2 x^(2) +(-3 x^(2) )=- x^(2) \\ 4x+5x=9x \\ -8+(-3)+19=8`
Put them in order of exponents

`- x^(2) +9x+8`

Hope this helps