exam Maths Puzzle Numerical Ability

I just get confused with problems such as:


y=(1/8)x^2

I need to find the x-intercepts, but I do not know how to put the equation into the form that is needed. I believe it is standard form.

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exam Other Question

Pi and the square root of two are rational numbers, since they can be expressed as the ratio of two intergers. is this true or false? What values of x may not be used in the expression ((x+5)/(x^2-4))?
I am completely clueless on this stuff it confuses me!
Thanks