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Mathematics 12 Online
OpenStudy (anonymous):

Which equation is a quadratic equation? 3x − y = 8x + 2 y = 7x(5 − 2x) + 9 7x2 + y = (3 + x)(7x − 1) y − 3 = (x2 − 3)(8x + 3)

OpenStudy (anonymous):

the 2rd one. You just need to know that a quadratic is x to the second power and the rest of the variables. The 1st is a regular linear equation, the 3rd subtracts out the 7x2 and the 4th has x to the 3rd power

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