What are the like terms in the expression below? 3mn – 4m + 2n + 7m – 5 a) 3, -4, 2, 7 & -5 b) 3mn, -4m, 2n, 7m c) 3mn, 2n d) -4m, 7m e) there are no like terms.

D. -4m, 7m

Step-by-step explanation:

Like terms are terms that can be added, subtracted, divided, and multiplied together. Since -4m and 7m both have the variable m, they are like terms. 3mn is not a like term because it has two variables which makes it different form -4m and 2n. It is its own term.

7

step-by-step explanation:

the answer would be 7

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!