exam Maths Puzzle Numerical Ability

I have a question that states: find all real zeros of the function:
a)f(x)=-7x^4+343x^2
b)f(x)=x^4-16x^2+15

I have no idea how to do these

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Use the square root property to solve the equation
(x-9)^2 = 36 Anu chooses a diagonal from a regular 8 sided polygon. Anitha chooses another diagonal from the same polygon. What is the probability that they choose 2 diagonals of the same leng