Which equation is a quadratic equation? y + 7 = −3x(4 − x) + 9x y = −2x + 5 y + 2x3 = (2x − 2)(x + 5) y − 9x = (x2 + 1)(5x − 1) + 3

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Which equation is a quadratic equation? y + 7 = −3x(4 − x) + 9x y = −2x + 5 y + 2x3 = (2x − 2)(x + 5) y − 9x = (x2 + 1)(5x − 1) + 3

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option 1
Thank you:)
i think it is a bit bizzarre to call \[y=x^2+3x+1\] a "quadratic equation" what does that make \[x^2+3x+1=0\]?

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83 and counting...
its really a quadratic function
well i guess it is function if you write it as one. maybe a quadratic polynomial? not sure, but it is confusing when one word (or in this case two, quadratic equation) is used to mean two different things.
yes i agree

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