Select all of the following that are quadratic equations.
3^2 - 2x = 2x + 5
6x^2+ 15x = 0
x^3 - 3x^2 + 1 = 0
9x - 2 = 0 7x^2 + 5x - 2 = 0
5x - 1 = 2x + 7

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the correct answers i think are b. and d.

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