Question

Which choice is equivalent to the expression below? 20 - 5+ 45 A. 4.15 B. 55 C. 135 D. 95

Answer 1

$\begin{gathered} \sqrt[]{20}-\sqrt[]{5}+\sqrt[]{45\text{ }}=\text{ }\sqrt[]{4\text{ x 5}}\text{ -}\sqrt[]{5}\text{ + }\sqrt[]{9\text{ x 5}} \\ =2\sqrt[]{5}-\sqrt[]{5}+3\sqrt[]{5} \\ =4\sqrt[]{5} \end{gathered}$