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solve u^2 = -4, where u is a real number. Simplify your answer as much as possible.

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Sagot :

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Answer:

2i and -2i

Step-by-step explanation:

I'll change u to x to be easier to understand.

x^2 = -4

sqrt(x^2) = sqrt(-4)

sqrt(-4) = 2i, or -2i

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