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melomori [17]
3 years ago
11

PLEASE HELP!! Algebra II

Mathematics
2 answers:
Natali [406]3 years ago
6 0

Hey there! :)

We are given the piecewise function:

\displaystyle \large{f(x) =  \begin{cases}  {x}^{3}  \:  \: (x < 0) \\  \sqrt[3]{x}  \:  \: (x > 0) \end{cases}}

To evaluate the value of function at x = -8 and x = 8, we know that -8 is less than 0 and 8 is greater than 0.

Therefore, if we want to evaluate the value of function at x = -8; we use the x^3 since it's given x < 0 for the function and for x = 8; we use the cube root of x since it's given x > 0.

Evaluate x = -8

From the piecewise function:

\displaystyle \large{f(x) =  \begin{cases}  {x}^{3}  \:  \: (x < 0) \\  \sqrt[3]{x}  \:  \: (x > 0) \end{cases}}

Since -8 is less than 0, we use x^3.

\displaystyle \large{f( - 8) =  {( - 8)}^{3} } \\  \displaystyle \large{f( - 8) =   - 512}

Evaluate x = 8

From the piecewise function, since 8 is greater than 0, we use the cube root of x.

\displaystyle \large{f(8) =  \sqrt[3]{8} }

To evaluate the cube root, first we prime-factor the number.

\displaystyle \large{f(8) =  \sqrt[3]{2 \cdot 2 \cdot 2} }

Since it's a cube root, we pull three 2's out of the cube root and write only one 2.

\displaystyle \large{f(8) =2}

Answer

  • f(-8) = -512
  • f(8) = 2

Let me know if you have any questions!

Nutka1998 [239]3 years ago
3 0

Answer:

f(-8) = -512, f(8) = 2

Step-by-step explanation:

Substitute x = -8 and 8 into the function, taking into account the rules of the function.

For x = -8, x < 0 so the value is equal to the cube of -8, which is -512.

For x = 8, x > 0 so the value is equal to the cube root of 8, which is 2.

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