please tell please question no 9
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(a + 1/a)^2 = a^2 + (1/a)^2 + 2×a×1/a
= a^2 + 1/a^2 + 2
= 18 + 2
(a + 1/a)^2 = √ 20
a + 1/a = √ 20
(a - 1/a)^2 = a^ 2 + (1/a)^2 - 2×a×1/a
= 18-2
(a - 1/a)^2 = √ 16
a - 1/a = 4
= a^2 + 1/a^2 + 2
= 18 + 2
(a + 1/a)^2 = √ 20
a + 1/a = √ 20
(a - 1/a)^2 = a^ 2 + (1/a)^2 - 2×a×1/a
= 18-2
(a - 1/a)^2 = √ 16
a - 1/a = 4
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