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Positive coefficient, even degree
x —> +infinity, f(x) —> +infinity
x —> -infinity, f(x) —> +infinity
(both arrows of parabola pointing up)
Positive coefficient, odd degree
x —> +infinity, f(x) —> +infinity
x —> -infinity, f(x) —> -infinity
(one arrow pointing up and right, other arrow pointing down and left)
Negative coefficient, even degree
x —> +infinity, f(x) —> -infinity
x —> -infinity, f(x) —> -infinity
(both arrows pointing down)
Negative coefficient, odd degree
x —> +infinity, f(x) —> -infinity
x —> -infinity, f(x) —> +infinity
(one arrow pointing up and left, other arrow pointing right and down)
Difference of cubes equation
a³-b³ = (a+b)(a²-ab+b²)
Sum of cubes equation
a³+b³ = (a-b)(a²+ab+b²)