(b)
Write $\sqrt{45}+\sqrt{20}$ in the form $k \sqrt{5}$
(f)

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Answer

$\boxed{5\sqrt{5}}$ is the final answer.

Steps

Step 1 ：Write $\sqrt{45}+\sqrt{20}$ in the form $k \sqrt{5}$

Step 2 ：First, simplify the square roots. We know that $\sqrt{45}$ can be written as $\sqrt{9*5}$ and $\sqrt{20}$ can be written as $\sqrt{4*5}$. This simplifies to $3\sqrt{5}$ and $2\sqrt{5}$ respectively.

Step 3 ：Adding these together gives $5\sqrt{5}$.

Step 4 ：$\boxed{5\sqrt{5}}$ is the final answer.

(b)Write $\sqrt{45}+\sqrt{20}$ in the form $k \sqrt{5}$(f)

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(b)
Write $\sqrt{45}+\sqrt{20}$ in the form $k \sqrt{5}$
(f)