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solving quadratic equation

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How do you solve these? Please show steps.

1) Simplify

3rd order radical of - (64), that is the cubic root of (-64)

2) Solve by completing the square (Don't forget the "i")
2x^2 + 4x + 6 = 0

3) Solve by quadratic formula
(2x -1)(x - 4) = 39

4) Solve by quadratic formula
-18 + x^2 - 7x = 0

5) Solve by quadratic formula
9 + x^2 - 6x = 18

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Solution Summary

It provides examples of solving quadratic equations by quadratic formula and completing the square. The solution is detaied and was rated '5/5' by the student who posted the questions.

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