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Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?

Factor 15x^3 - 5x^2 +6x-2 by grouping. what is the resulting expression

Which of the following questions describes the equation g + (-4) = -5? a)what number, when added to negative four, is equal to negative five? b)what number, when added to negative five, is equal to negative four? c)what number, when subtracted from negative four, is equal to negative five? d)what number, when subtracted from negative five, is equal to negative four?