YuliaP769173 YuliaP769173
  • 25-10-2022
  • Mathematics
contestada

WITHOUT using a graphing device, find the x- and y-intercepts of the graph:y = 3x^3 - 9x^2

WITHOUT using a graphing device find the x and yintercepts of the graphy 3x3 9x2 class=

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PatrickJ601961 PatrickJ601961
  • 25-10-2022

Given:

The function is,

[tex]y=3x^3-9x^2[/tex]

To find the x intercept set y=0,

[tex]\begin{gathered} y=3x^3-9x^2 \\ 3x^3-9x^2=0 \\ x^2(3x-9)=0 \\ \Rightarrow x^2=0,3x-9=0 \\ x=0,3x=9 \\ x=0,x=\frac{9}{3} \\ x=0,x=3 \end{gathered}[/tex]

So, x-intercepts are ( 0 , 0 ), ( 3, 0 ).

Now to find y-intercepts set x=0.

[tex]\begin{gathered} y=3x^3-9x^2 \\ y=3(0)-9(0) \\ y=0 \end{gathered}[/tex]

y- intercept is ( 0 ,0 )

Answer: option e)

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