Marco wrote the expression (2x − 4y)2 = 4x2 − 16y2. Complete the explanation and correct his error. Marco may have confused a difference of the squares and the square of a binomial
(select) difference or sum
.

He wrote the difference of the squares of the terms instead of the square of a
(select) binomial or trinomial
difference.

Step-by-step explanation:

Marco may have confused a difference of the squares and the square of a binomial

difference.

He wrote the difference of the squares of the terms instead of the square of a

binomial

difference

The correct answer should be

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!