Answer
$7i$
Work Step by Step
Step 1: $\sqrt {-4}+\sqrt {-25}$
Step 2: $\sqrt {-1\times4}+\sqrt {-1\times25}$
Step 3: $(\sqrt {-1}\times\sqrt 4)+(\sqrt {-1}\times\sqrt {25})$
Step 4: $(i\times2)+(i\times5)$
Step 5: $2i+5i$
Step 6: $7i$
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