Question

a
$a {}^{2} + \frac{1}{ a {}^{2} } = 7 \: then \: find \: a + \frac{1}{a} =$
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Answer 1

Answer:

+-3

Step-by-step explanation:

a² + 1/a² + 2 = 9

(a + 1/a)² = 9

Answer 2

Step-by-step explanation:

a^2 + (1/a^2) = 7

a^2 + (1/a^2) + 2 = 7 +2

{a+(1/a)}^2 = 9

taking square root

(a + 1/a) = 3