Question

the value of 5/21÷-5/21

Answer 1

Answer:

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Answer 2

Answer:

Required value is (-1)

Step-by-step explanation:

Given,5/21÷(-5/21)

$\frac{5}{21} \div ( - \frac{5}{21} ) \\ = \frac{ \frac{5}{21} }{ - \frac{5}{21} } \\ = \frac{5}{21} \times ( - \frac{21}{5} ) \\ = - ( \frac{5}{21} \times \frac{21}{5} ) \\ = - \frac{1}{1} \\ = ( - 1)$

So, required value is (-1).

This is a problem of Algebra.

Some important Algebra formulas.

(a + b)² = a² + 2ab + b²

(a − b)² = a² − 2ab − b²

(a + b)³ = a³ + 3a²b + 3ab² + b³

(a - b)³ = a³ - 3a²b + 3ab² - b³

a³ + b³ = (a + b)³ − 3ab(a + b)

a³ - b³ = (a -b)³ + 3ab(a - b)

a² − b² = (a + b)(a − b)

a² + b² = (a + b)² − 2ab

a² + b² = (a − b)² + 2ab

a³ − b³ = (a − b)(a² + ab + b²)

a³ + b³ = (a + b)(a² − ab + b²)

Know more about Algebra,

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