Identifying Quadratic Equation

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This video is used for flipped classroom.
(Lecturer) Ms. Chelsea Parreño, secondary mathematics teacher 📚

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if the exponent is negative is it still quadratic? for example: x^-2 + 6x - 12 = 0

shoetime
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May I ask? How can you say if a particular equation is a quadratic equation?

lx
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Y=(x+3) (x-3) is it a quadratic equation?

trynaKen
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how about -2m²+m=1? Is it still quadratic?

reesemontebello