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# Can a cubic function have 3 turning points?

## Can a cubic function have 3 turning points?

In particular, a cubic graph goes to −∞ in one direction and +∞ in the other. So it must cross the x-axis at least once. Furthermore, all the examples of cubic graphs have precisely zero or two turning points, an even number.

How many turning points does a cubic function with 3 real zeros have?

2 turning points
Cubic functions can have at most 3 real roots (including multiplicities) and 2 turning points.

How do you find the turning point of a cubic function?

Sketching cubic graphs (EMCHG) Determine the x-intercepts by factorising ax3+bx2+cx+d=0 and solving for x. Find the x-coordinates of the turning points of the function by letting f′(x)=0 and solving for x. Determine the y-coordinates of the turning points by substituting the x-values into f(x).

### What is the max number of turning points?

The maximum number of turning points of a polynomial function is always one less than the degree of the function. A turning point is a point of the graph where the graph changes from increasing to decreasing (rising to falling) or decreasing to increasing (falling to rising).

Why does a cubic function have 2 turning points?

The curve has two distinct turning points if and only if the derivative, f′(x), has two distinct real roots. Now f′(x)=3×2+2ax+b, which has two distinct real roots when the discriminant is greater than 0.

What does a multiplicity of 3 mean?

The graph passes through the axis at the intercept but flattens out a bit first. This factor is cubic (degree 3), so the behavior near the intercept is like that of a cubic with the same S-shape near the intercept as the function f(x)=x3 f ( x ) = x 3 . We call this a triple zero, or a zero with multiplicity 3.

## Is it possible to have exactly 3 real zeros Why?

Regardless of odd or even, any polynomial of positive order can have a maximum number of zeros equal to its order. For example, a cubic function can have as many as three zeros, but no more. This is known as the fundamental theorem of algebra.