book Maths Puzzle Numerical Ability

Why is it sufficient to define a quadratic function, f(x)=ax^2+bx=c in terms of a, b, and c?

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book Other Question

If you are dealing with complex numbers, how would you graph,

-4i

How would you graph
-2-i
cosq</font> = 5/12 and tanq</font> is negative, find the exact value for cscq</font>.</PRE>