Which of the following is equivalent to 18- the square root of -25? A. 5i B.18-5i C. 18+5i D.23 ?

asked Jun 22, 2017 74.6k views

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(√(mn))=(√m)(√n)
18-√(-25)
√(-25)=(√-1)(√25)=(√-1)(5)=5√-1
18-5√-1
remember that √-1=i
18-5i

B is the answer

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The answer is B : the square root of 25 is 5, because 5x5=25. So it's 18-5.... Hope I helped :)

Dallaylaen answered Jun 27, 2017

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