exam Maths Puzzle Numerical Ability

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

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exam Other Question
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 please help me to solve the systems of equations


3/2X-1/3Y=1/2
2X-1/2Y=-1/2