Question

Which graph represents f(x)= -1/2x^3

Answer 1

Answer:

Last graph represents the given function.

Step-by-step explanation:

First, we need to consider a few rules about transformation of functions, specifically about the negative sign and the division of the function by a number.

The negative sign indicates that the function has to be reflected regarding the vertical axis. The normal function is like the third option, and the reflect one is like the last graph.

On the other hand, the fraction presents a contraction of the function size, but this characteristics is not enough to select the right graph, because third and fourth options have the same size.

Therefore, according to the negative sign in the given function, the correct answer is the last graph.

Answer 2

We want to see which one of the given graphs is the graph of the function:

f(x) = (-1/2)*x^3

The correct graph is the last one, positive at the left, when x is negative, and negative at the right, when x is positive.

Let's analyze our function, first we know that the parent cubic function:

g(x) = x^3

Is negative for negative values of x and positive for positive values of x, then the graph is below the horizontal axis at the left, and above the horizontal axis at the right.

But our function multiplies this by a negative number, -1/2.

Then that is inverted, we should see that at the left, the graph is above the horizontal axis, and at the right the graph is below the horizontal axis.

Then the correct option is the last graph.

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