exam Maths Puzzle Numerical Ability

Can someone please help me with plotting this exponential and logarithmic funtion on a graph?

f(x)= log3x

If some can help me with this I would really appreciate it. Thank

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exam Other Question

this one is a pain and I need help!

x^2+8=57

its one of these

a +-square root 65

b +-square root 57-8

c +-square root 7

d +-square root 57+8 Can you please explain...I tried working it myself, but did not come up with correct answer...instructions...given f(x) = 5x^2-3x+1, find f(-2).

5x^2-3(-2)+1
-20+6+1
-14+1=-13

did I do this correctly?