if a2+1/A2 = 7 find a2-1/a2
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(a + (1/a))2 = a2 + (1/a2) + 2. ⇒ (3 )2 = a2 + (1/a2) + 2. ⇒ 9 = a2 + (1/a2) + 2. ⇒ 9 -2 = a2 + (1/a2). ⇒ 7 = a2 + (1/a2). ∴ a2 + (1/a2) = 7.
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