Answer:
[tex]x = - 1.27 \: and \: x= 3.67[/tex]
Step-by-step explanation:
We want to solve
[tex] {x}^{4} - 3 {x}^{3} - 5x - 15 = 0[/tex]
We can solve this by graphing:
[tex]y = {x}^{4} - 3 {x}^{3} - 5x - 15 [/tex]
The x-intercepts are the solution to the given equation.
From the graph, the x-intercepts are
[tex]x = - 1.27 \: and \: x= 3.67[/tex]
See attachment
