Find the Domain y = square root of 1+5x

$y = \sqrt{1 + 5 x}$

Step 1

Set the radicand in $\sqrt{1 + 5 x}$ greater than or equal to $0$ to find where the expression is defined.

$1 + 5 x \geq 0$

Step 2

Solve for $x$ .

Subtract $1$ from both sides of the inequality.

$5 x \geq - 1$

Divide each term in $5 x \geq - 1$ by $5$ and simplify.

Divide each term in $5 x \geq - 1$ by $5$ .

$\frac{5 x}{5} \geq \frac{- 1}{5}$

Simplify the left side.

Cancel the common factor of $5$ .

Cancel the common factor.

$\frac{5 x}{5} \geq \frac{- 1}{5}$

Divide $x$ by $1$ .

$x \geq \frac{- 1}{5}$

Simplify the right side.

Move the negative in front of the fraction.

$x \geq - \frac{1}{5}$

Step 3

The domain is all values of $x$ that make the expression defined.

Interval Notation:

$[- \frac{1}{5}, \infty)$

Set-Builder Notation:

${x | x \geq - \frac{1}{5}}$

Step 4