Question

Plz help me with this

Answer 1

Answer:  c) i

Step-by-step explanation:

$\sqrt{-25}-\sqrt{-16}\\\\=\sqrt{-1\cdot 5\cdot 5}-\sqrt{-1\cdot 4\cdot 4}\\\\=5i-4i\qquad \qquad \qquad \qquad \text{Note: }\sqrt{-1}=i\\\\=i$

Answer 2

Answer:

i

Step-by-step explanation:

note that $\sqrt{-1}$ = i

Given

$\sqrt{-25}$ - $\sqrt{-16}$

= $\sqrt{25(-1)}$ - $\sqrt{16(-1)}$

= $\sqrt{25}$ × $\sqrt{-1}$ - ( $\sqrt{16}$ × $\sqrt{-1}$)

= 5i - 4i

= i