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Complex Numbers and Quadratic Equations — Maths STD 11 Science — Question

CBSE BoardEnglish MediumSTD 11 ScienceMathsComplex Numbers and Quadratic Equations1 Mark
Question
The value of $\sqrt{-25}\times\sqrt{-9}$ is ___________.
✓

Answer

The value of $\sqrt{-25}\times\sqrt{-9}$ is -15.
Solution:
$\sqrt{-25}\times\sqrt{-9}=\text{i}\sqrt{25}\times\text{i}\sqrt{9}$
$=\text{i}^2(5\times3)=-15$

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