Question

if y _ 1/y = 7 then evaluate y4 + 1/y4​

Answer 1

Step-by-step explanation:

$y - \frac{1}{y} = 7$

${y}^{2} + \frac{1}{ {y}^{2} } - 2 = 49$

${y}^{2} + \frac{1}{ {y}^{2} } = 51$

${y}^{4} + \frac{1}{ {y}^{4} } + 2 = 2601$

${y}^{4} + \frac{1}{ {y}^{4} } = 2599$

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