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timama [110]
2 years ago
6

If a+1/a=3What is the answer? a⁵+1/a⁵​

Mathematics
1 answer:
luda_lava [24]2 years ago
5 0

Answer:

123

Step-by-step explanation:

We can square and cube the equation, then multiply the results together.

(a + \frac{1}{a}) = 3 ← square both sides

a² + 2 + \frac{1}{a^2} = 9 ( subtract 2 from both sides )

a² + \frac{1}{a^2} = 7 → (1)

-----------------------

Now cube both sides

a³ + \frac{1}{a^3} + 3(a + \frac{1}{a}) = 27

a³ + \frac{1}{a^3} + 3(3) = 27

a³ + \frac{1}{a^3} + 9 = 27 ( subtract 9 from both sides )

a³ + \frac{1}{a^3} = 18 → (2)

------------------------------

Multiply (1) and (2)

(a² + \frac{1}{a^2} )(a³ + \frac{1}{a^3} ) = 7(18)

a^{5}  + ( \frac{1}{a} + a) + \frac{1}{a^5} = 126

a^{5} + 3 + \frac{1}{a^5} = 126 ( subtract 3 from both sides )

a^{5} + \frac{1}{a^5} = 123

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