Question

Find the product:

(r+2)(r-5)(r-2)(r+5)

Please show all steps.

15 points.

Answer 1

by rearranging and foiling them

(r+2)(r-2)(r+5)(r-5)

`{r }^(2) - 4`

`{r}^(2) - 25`

now foil them

r^4-25r^2-4r^2+100

r^4-29r^2+100

Answer 2

Hello from MrBillDoesMath!

Answer:

r^4- 29r^2 + 100

Discussion:

Rearrange the terms in the product as follows:

(r+2)(r-2) * (r-5)(r+5) =

(r^2 - 4) * (r^2-25) =

f^4 - (25+4)r^2 + 4*25 =

r^4- 29r^2 + 100

Thank you,

MrB