Find the Domain y = square root of 4x+5

$y = \sqrt{4 x + 5}$

Step 1

Set the radicand in $\sqrt{4 x + 5}$ greater than or equal to $0$ to find where the expression is defined.

$4 x + 5 \geq 0$

Step 2

Solve for $x$ .

Subtract $5$ from both sides of the inequality.

$4 x \geq - 5$

Divide each term in $4 x \geq - 5$ by $4$ and simplify.

Divide each term in $4 x \geq - 5$ by $4$ .

$\frac{4 x}{4} \geq \frac{- 5}{4}$

Simplify the left side.

Cancel the common factor of $4$ .

Cancel the common factor.

$\frac{4 x}{4} \geq \frac{- 5}{4}$

Divide $x$ by $1$ .

$x \geq \frac{- 5}{4}$

Simplify the right side.

Move the negative in front of the fraction.

$x \geq - \frac{5}{4}$

Step 3

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

Interval Notation:

$[- \frac{5}{4}, \infty)$

Set-Builder Notation:

${x | x \geq - \frac{5}{4}}$

Step 4