exam Maths Puzzle Numerical Ability

I need help in finding the x-intercept and the y-intercept of this function

f(x)=3/x2-4

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exam Other Question

How do you solve this:

m2 + n2/m2-n2 + m/n-m + n/m+n
19. simplify
(mn2)-3

36. (2a2y-4z-5)3

73. multiply or divide and write scientific notation for the result.
(5.2 * 10 to the power of 5)(6.5 * 10 to the power of -2)