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Q.

Which of the following is equal to −13 ?

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a

3+−12

b

−3+−1−4

c

3−−1−4

d

−−1

answer is B.

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Detailed Solution

x=−13⇒ x3=−1⇒ (−x)3=1⇒ −x=1,ω,ω2⇒ x=−1,−ω,−ω2=−1,1+3i2,1−3i2=−1,−3+i2i,3+i2i=−1,−3+−1−4,3+−1−4
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Which of the following is equal to −13 ?