Simplify:
2x (-2x-3)
Help

-4x^2 - 6x

Step-by-step explanation:

You want to expand it by distributing terms.

2x x -2x + 2x x -3

Next, take out the constants.

(2 x -2)xx + 2x x -3

Next, simplify 2 x -2 to -4.

-4xx + 2x x -3

Then, use the product rule : x^a x^b = x^a + ^b.

-4x^2 + 2x x -3

Last, simplify 2x x -3 to -6x.

-4x^2 - 6x

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!