What special word is used to describe a polygon which has equal sides?

Hey there! I'm happy to help!

In geometry, a polygon with all equal sides is called an equilateral polygon. You can see the words equal and lateral in that word. Lateral has to do with sides, so the word equilateral literally means "equal sides". How cool!

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add an !

step-by-step explanation:

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

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