Question

Use the x-intercept method to find all real solutions of the equation.
x^3-11x^2+31x-21=0

Answer 1

C. is the answer

Explanation:

Answer 2

c.
`x=1,3,\:or\:7`

Explanation:

The given equation is

`x^3-11x^2+31x-21=0`

To find all real solutions using the x-intercept method, we to graph the corresponding function using a graphing tool.

The corresponding function is;

`f(x)=x^3-11x^2+31x-21`

From the graph the x-intercepts are

(1,0),(3,0) and (7,0).

Therefore the real solutions are

`x=1,3,\:or\:7`