Given the expression:
[tex]k^4-7k^2[/tex]Let's evaluate the expresion if k = 3.
To evaluate this expression, substitute 3 for k and solve.
We have:
[tex]\begin{gathered} k^4-7k^2 \\ \\ 3^4-7(3)^2 \\ \\ 81-7(9) \\ \\ 81-63 \\ \\ =18 \end{gathered}[/tex]Therefore, the value of the expression if k = 3 is 18 .
ANSWER:
18
