So we notice that is the special factorization known as 'the difference of two perfect squares' exg a^2-b^2=(a-b)(a+b) so x^4=(x^2)^2 and 1=1^2 so (x^2)^2-(1)^2=(x^2-1)(x^2+1)
An easy way to solve this is looking at whether the line has a positive or negative slope. We read graphs from left to right so <u>if the line is increasing from left to right, it has a positive slope while a line decreasing from left to right has a negative slope</u>. Since the line shown is decreasing from left to right, it will have a negative slope and Roman is the only one out of the two that shows a negative slope. To check to see if he's correct, we can check the y-intercept. The y-intercept of the line is 8 and Roman also has 8 written in the expression. Hence, meaning Roman is correct.
