exam Maths Puzzle Numerical Ability

i cant solve this problem because of lack knowing in solving this algebra problem 2^3 2^3
x^4 x
(4^4 y^7) (-5x^5y^2)
(4nx^5^n) (5nx^4^n)
(2^3)^2

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exam Other Question

f(x)=2x^2-x+7 ; g(x)=x-1

find (f-g)(x)

I don't know if I am to just subtract or put in the proper way. I am lost. Hey guys, can I have help with this? It's a true or false thing, if I may.

1. If two triangles are equilateral, they are similar.
2. If two triangles are equiangular, they are