a+1/a=17/4.find a²+1/a²
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(a + 1/a)² = (17/4)²
a² + 2 . a . 1/a + 1/a² = 289/16
a² + 1/a² + 2 = 289/16
a² + 1/a² = 289/16 - 2
a² + 1/a² = 289/16 - 32/16
a² + 1/a² = 257/16
a² + 2 . a . 1/a + 1/a² = 289/16
a² + 1/a² + 2 = 289/16
a² + 1/a² = 289/16 - 2
a² + 1/a² = 289/16 - 32/16
a² + 1/a² = 257/16
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