simplify
3\sqrt{5}+\sqrt{20}-\sqrt{45}
To simplify this expression, we need to simplify each of the square roots:
3√5 = 3√5
√20 = √(4*5) = 2√5
√45 = √(9*5) = 3√5
Now, plug these simplified square roots back into the original expression:
3√5 + 2√5 - 3√5
Combine like terms:
3√5 + 2√5 - 3√5 = 2√5
Therefore, the simplified expression is 2√5.