# What is the Derivative of 4x?

Apply the Power Rule: ($f \left(x\right) = a {x}^{n} \implies f p r i m e \left(x\right) = a \times n \times {x}^{n - 1}$)
$f \left(x\right) = 4 {x}^{1}$
$\implies f p r i m e \left(x\right) = 4 \times 1 \times {x}^{0}$
${x}^{0} = 1$
$\implies f p r i m e \left(x\right) = 4$