Find the Domain y = square root of -4x-36

$y = \sqrt{- 4 x - 36}$

Step 1

Set the radicand in $\sqrt{- 4 x - 36}$ greater than or equal to $0$ to find where the expression is defined.

$- 4 x - 36 \geq 0$

Step 2

Solve for $x$ .

Add $36$ to both sides of the inequality.

$- 4 x \geq 36$

Divide each term in $- 4 x \geq 36$ by $- 4$ and simplify.

Divide each term in $- 4 x \geq 36$ by $- 4$ . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.

$\frac{- 4 x}{- 4} \leq \frac{36}{- 4}$

Simplify the left side.

Cancel the common factor of $- 4$ .

Cancel the common factor.

$\frac{- 4 x}{- 4} \leq \frac{36}{- 4}$

Divide $x$ by $1$ .

$x \leq \frac{36}{- 4}$

Simplify the right side.

Divide $36$ by $- 4$ .

$x \leq - 9$

Step 3

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

Interval Notation:

$(- \infty, - 9]$

Set-Builder Notation:

${x | x \leq - 9}$

Step 4

Find the Domain y = square root of -4x-36

Related Questions

Support LCMGCF.com by disabling your adblocker.