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Hello! For question #8 on page 111…

Hello! For question #8 on page 111 in the Exponents and Exponential Functions section, where did the 2^2 come from? The answer was 82.41*2^2= 329.6. Thank you ^_^.

Hi! For question #9 on page 111…

Hi! For question #9 on page 111 in the Exponents and Exponential Functions section, how did you get 2mn in m^2+2mn+n^2=m^2+n^2? Thank you!

COLLEGE BOARD Test 9 Math Section 3 #13

COLLEGE BOARD Test 9 Math Section 3 #13

Could you suggest a shortcut or fast way to solve this? All the answers are written in vertex form, so we can quickly eliminate two of them, as the coordinates of the vertex, as indicated by the graph provided, must be (3,1). That leaves choices A and C. Is there a quick way to solve from there without plugging in values from the graph?