how the element 2+√3 has a multiplicative inverse in Q(√3). Show that Q(√3) is a subfield of C

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Q: (1) (a) show that 21 divides 4+1 +52-1 for n ≥ 1

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Q: 8. One root of the equation x³ + 2x − 3x² - 6 = 0 is a. 3 b. -1 c. -3 d. 1

A: So 3 is a root of the equation as f(3)=0.So option a is correct.

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