Given (-2x + 7)(-3x - 2) = Ax^2 + Bx + C, what is the value of A + B?

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You need to rewrite the left side of the equation in "standard" form. (-2x + 7)(-3x - 2) = Ax^2 + Bx + C6x^2 + 4x - 21x - 14 = Ax^2 + Bx + C6x^2 - 17x - 14 = Ax^2 + Bx + CA = 6, B = -17, C = -14I think it's important to be comfortable with all of the equivalent forms of a quadratic expression. They all have their advantages.