Vance built a triangular sand box for his daughter. The measures of the lengths of the sides are 21 feet, 28 feet, and 37 feet. Explain how you know that the sand box is not in the shape of a right triangle?

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!

you could deduce the conclusion directly using the facts pertaining to the specific situation.

hope this .