We have

so this is indeed a difference of squares. Factorizing would give

making the answer D.
We can further factor the first term here and write

but that's clearly out of the scope of this question.
Simplfy then combine like terms so the anwser Simplified and Evaluated is -17x-19
Answer: 37.5
Step-by-step explanation:
75 divided by 2
Let x represent first number in pair and y represent second number. We can see that x numbers are increasing by 1 on each next pair. y numbers are square of 0,2,4,6 and 8
Knowing all of that let "n" represent the position of the pair starting from 0!
than we can write that the rule is:
(n,(2n)^2)
21g-6f-8g
13g-6f is the answer
combine like terms