exam Maths Puzzle Numerical Ability

given x^2-(6+3i)x+k=0 has a solution of 3, find the value of k, and find a second solution.

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exam Other Question

This is a quadratic equation/ word problem

Y(x) = �3.3x2 + 0.5x + 300.
I need to use this function to tell researchers what value of x produces the maximum output
signal for Please help

The quotient of x minus two divided by four plus twelve equals fourteen