exam Maths Puzzle Numerical Ability

Use the square root property to solve the equation
(x-9)^2 = 36

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exam Other Question

Factor the following
x2-x-30
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