Expand.

Your answer should be a polynomial in standard form.

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

131.25

Step-by-step explanation:

25r²-10r+10r-4=0

25r²-4=0 (Since - 10 and 10 cancel each other out)

25r²=4

Divide both sides by 4 to get r² = 6.25

Square both sides to get r = 2.5

Plug 2.5 back into the equation to get the answer of 131.25