5th grade "tony had an equal number of cranberry bars and walnut bars. he gave away 66 cranberry bars. he then had 4 times as many walnut bars as cranberry bars lef. how many bars did he have at first?

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!

- (2, -7)

- lines r and s and lines t and u must be parallel