Ill give brainliest explain the answer too

(x^2+2x+1)

2x^2+2x+3-x^2-2x-1=

x^2+2

The Answer is: i, where "i" is an imaginary number, the square root of negative 1.

Step-by-step explanation:

(2x^2 + 2x + 3) - (x^2 + 2x + 1) =

2x^2 + 2x + 3 - x^2 - 2x - 1 =

2x^2 + 2 =

2x^2 = -2

x^2 = -2/2

x^2 = -1

x = Sqrt -1 = i, where "i" is an imaginary number, the square root of negative 1.

the least common denominatore of 7 and 2 is 9

step-by-step explanation:

7+2=9

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!