Question

Hello, need some help on this one. I was wondering for part A what is the equation I enter into desmos? Thank you!

Answer 1

SOLUTION:

Case: Piecewise functions

Method:

a) The graph:

The equations:

Domain:

$(-\infty,4)\cup[4,\infty)$

b) x-intercepts

$\begin{gathered} x^3-16x=0 \\ x(x^2-16)=0 \\ x(x-4)(x+4)=0 \\ x=0,x=4,x=-4 \\ But\text{ }x<4 \\ Hence \\ x=0,x=-4 \end{gathered}$

Also

$\begin{gathered} -log_4(x-3)+2=0 \\ log_4(x-3)=2 \\ x-3=4^2 \\ x-3=16 \\ x=16+3 \\ x=19 \end{gathered}$

The x-intercepts are:

x= 0, x = 19, x= -4

c) The intervals where g(x) is positive include:

$[-4,0]\cup[4,19]$