1.y=9-2x³ quadratic function or not quadratic function justify it
2.y=(x-2)(x+4) quadratic function or not quadratic function justify it
3.y=2x+5 quadratic function or not quadratic function justify it
4.y=x³+x²+1 quadratic function or not quadratic function justify it
5.y=2x²+2 quadratic function or not quadratic function justify it
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