## Intermediate Algebra for College Students (7th Edition)

Substitute $4$ to $x$ in the given equation to obtain: $\sqrt{5(4) + 16}=4+2 \\\sqrt{20+16} = 6 \\\sqrt{36} = 6 \\6=6$ $4$ satisfies the equation so it is a solution of the equation. Thus, the given statement is true.