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cluponka [151]
3 years ago
11

Given that,

Biology
2 answers:
Ratling [72]3 years ago
8 0

Answer:

The answer is 23.

Explanation:

You square the 1st expression and you will get the 2nd expression :

{(x + \frac{1}{x}) }^{2} = {5}^{2}

{x}^{2} + 2(x)( \frac{1}{x}) + { (\frac{1}{x}) }^{2} = 25

{x}^{2} + 2 + \frac{1}{{x}^{2}} = 25

{x}^{2} + \frac{1}{{x}^{2}} = 23

Novosadov [1.4K]3 years ago
3 0

Answer:

23

Explanation:

Use: $(a+b)^2= a^2+2 ab+b^2$

Square both sides:

\Big( x+\frac{1}{x}\Big)^2=5^2\\\implies x^2+2(x) \Big(\frac{1}{x}\Big) +\frac{1}{x^2}=25\\\implies x^2+\frac{1}{x^2}=25-2=\boxed {\color{red}{23}}

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