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MrMuchimi
4 years ago
8

Help please!!! √−100 = + i

Mathematics
1 answer:
Semmy [17]4 years ago
3 0

Answer:

\sqrt{-100}=10i

Step-by-step explanation:

If you're asking what is \sqrt{-100}:

\sqrt{-1}\sqrt{100}\\\sqrt{100}i\\10i

Otherwise, \sqrt{-100}=i is not true.

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Domain:\ x\neq-2\\\\\dfrac{x+2}{x-4}

Other method:

\dfrac{x+2}{x-4}

zeros of numerator and denominator are x = -2 and x = 4.

Look at the second picture.

for x < -2 → x + 2 < 0 and x - 4 < 0

therefore \dfrac{x + 2}{x - 4}=\dfrac{(-)}{(-)}>0

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therefore \dfrac{x+2}{x-4}=\dfrac{(+)}{(-)} < 0

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