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What is equivalent to 13 - √( - 81)
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What is equivalent to

13 - √( - 81)

User Cjbottaro
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√- 81 doesn't result in a rational number because you can't get a negative from squaring any number. Instead you get a number with an imaginary number.

13 - √- 81 = 13 - 9i
User Jaco Pretorius
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