What is the simplified form of this expression?

(-x2 + x) + (4x2 − x − 1)

Explanation:

The x^2 terms add to -x^2+4x^2 = 3x^2

The x terms add to x+(-x) = x-x = 0x = 0

The constant -1 doesn't have anything to pair with it, so it just stays as is.

So overall we end up with 3x^2-1

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!

answer: h=5.6 i don't really know how to put into words, so i though i would let you do that. i hope i was able to some

step-by-step explanation:

18 = 6(h)+1/2

18 = 6h+1/2

18-1 = 6h/2

17 = 3h

17/3 = h

h = 5.6