exam Maths Puzzle Numerical Ability

Find the value for k that will make 4x^2+6.4x +k a perfect square.

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exam Other Question

Apply the quadratic formula to find the roots of the given function, and then graph the function.

g(x) = x2 + x + 12 please help me to answer this question, the directions are:
determine the intervals of increasing and decreasing.

f(x)=-2x^3-3x^2+12