Kelly was given a square piece of material whose dimensions were 5x inches by 5x inches. she felt that it was a little too big for the project she was working on, so she cut 1 inch off each side of the square. which of the following expressions represents the area of the remaining piece of material, in square inches?

25x^2 - 20x + 4

Explanation:

Multiply (5x-2) by (5x-2).

25x^2 - 10x - 10x + 4.

Hope this helps!

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!