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How does one identify a function as linear, quadratic, or neither? for example, f(x)=-x^2​

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for a function to be linear, it will be a straight line and use the equation y = mx + b (m = slope, b = y-intercept). for a function to be quadratic, it fill form a parabola (like patrick star's head), and use the equation Ax^2 + Bx + C = 0. the only neither i can currently think of is a sine wave, a line that goes up and down and looks like a sound wave.

User Neilon
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