## Algebra 1: Common Core (15th Edition)

$\sqrt 16$ means that we are supposed to find what number times itself equals 16. We recall that 4 times 4 is 16, so $\sqrt 16$ is 4. However, there is a negative outside of the $\sqrt 16$. This means that we multiply the $\sqrt 16$ by negative 1, leaving us with the answer: -4.