Question

plz help me as fast as you can​

Answer 1

Answer:

Hope my answer helps you mate :-)

Step-by-step explanation:

$a + \frac{1}{a} = 2 \\ \\ squaring \: \: both \: sides \\ \\ {(a + \frac{1}{a}) }^{2} = 4 \\ \\ by \: identity \: {(a + b)}^{2} = {a}^{2} + {b}^{2} + 2ab \\ \\ {a}^{2} + { \frac{1}{a} }^{2} + 2 = 4 \\ \\ {a}^{2} + { \frac{1}{a} }^{2} = 2$

Now again squaring both sides

${( {a}^{2} + { \frac{1}{a} }^{2} ) }^{2} = 4 \\ \\ {a}^{4} + { \frac{1}{a} }^{4} = 4 - 2 \\ \\ {a}^{4} + { \frac{1}{a} }^{4} = 2$

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