Chapter 4 - Section 4.9 - Antiderivatives - 4.9 Exercises - Page 355: 9

$x\sqrt 2+C$

$\int\sqrt 2 dx$ When taking the antiderivative of a constant, we use the power rule to find that the constant simply is multiplied by $x$. With a constant of$ \sqrt 2$, the antiderivative is thus $x\sqrt 2+C$.