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K^4 - 7k^2 ( if k = 3 ) Evaluate each expression given the variable replacement

User Jason Stokes
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1 Answer

14 votes
14 votes

Given the expression:


k^4-7k^2

Let's evaluate the expresion if k = 3.

To evaluate this expression, substitute 3 for k and solve.

We have:


\begin{gathered} k^4-7k^2 \\ \\ 3^4-7(3)^2 \\ \\ 81-7(9) \\ \\ 81-63 \\ \\ =18 \end{gathered}

Therefore, the value of the expression if k = 3 is 18 .

ANSWER:

18

User Peter Becker
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