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2 years ago

Is 42,260 a rational or irriational number

Mathematics

2 answers:

inna [77]2 years ago

7 0

Answer:

rational

Step-by-step explanation:

it can be written as a ratio like 42260/1

brainliest?? please

Mrac [35]2 years ago

6 0

Answer:

Rational

Step-by-step explanation:

This number is a whole, even number. It does not fit the criteria to be irrational because it can be written as a simple fraction

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4) If x-1/x=5, fand the value of x²+ 1/x²

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Given:

$\sf x\ -\ \dfrac{1}{x}\ =\ 5$

To find:

$\sf The\ value\ of\ x^2\ +\ \dfrac{1}{x^2}.$

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Let's square the above expression.

$\sf \bigg(x\ -\ \dfrac{1}{x}\bigg)^2\ =\ 5^2$

According to the identities, (a - b)² = a² - 2ab + b². Using the same logic for the expression above,

$\sf x^2\ -\ 2\ \times\ x\ \times\ \dfrac{1}{x}\ +\ \dfrac{1}{x^2}\ =\ 25\\\\\\x^2\ -\ 2\ +\ \dfrac{1}{x^2}\ =\ 25\\\\\\x^2\ +\ \dfrac{1}{x^2}\ =\ 25 + 2\\\\\\x^2\ +\ \dfrac{1}{x^2}\ =\ 27$

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