Consider a cubic function of the form [tex]f(x) = k x^3[/tex] that goes through the point [tex]\((3, 54)\)[/tex].

Can you find the value of the constant [tex]\(k\)[/tex]?



Answer :

Certainly! To determine the value of the constant [tex]\( k \)[/tex] in the cubic function [tex]\( f(x) = kx^3 \)[/tex] that passes through the point [tex]\((3, 54)\)[/tex], we can follow these detailed steps:

1. We are given the point [tex]\((3, 54)\)[/tex], which means that when [tex]\( x = 3 \)[/tex], the function value [tex]\( f(x) = 54 \)[/tex].
2. Substitute [tex]\( x = 3 \)[/tex] and [tex]\( f(x) = 54 \)[/tex] into the function [tex]\( f(x) = kx^3 \)[/tex].

[tex]\[ f(3) = k \cdot 3^3 = 54 \][/tex]

3. Simplify the equation [tex]\( k \cdot 3^3 = 54 \)[/tex]:

[tex]\[ k \cdot 27 = 54 \][/tex]

4. Solve for [tex]\( k \)[/tex] by isolating it on one side of the equation:

[tex]\[ k = \frac{54}{27} \][/tex]

5. Perform the division:

[tex]\[ k = 2 \][/tex]

Therefore, the value of the constant [tex]\( k \)[/tex] is [tex]\( 2 \)[/tex].