book Maths Puzzle Numerical Ability

Variations
The area of a circle varies directly as the square of the length of its diameter. What is the constant variation?
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book Other Question

Write a quadratic equation that has the following two solutions:
x = 4 and x = -9)
here is my equation

(x - 4)(x + 9) = 0

x² + 5x - 36 = 0</PRE>
i am having problem with functions, like input and output problem can you keep.
please help A.S.A.P