Question

The value of (2/5) -3​ is

Answer 1

Answer:

125 / 8

Step-by-step explanation:

(2/5) -3

(5/2) 3

=125/8

Or

(2/5)-3

2-15 / 3

= -13 / 3

Answer 2

Answer:

The value of (2/5) -3 is $- 2 \frac{2}{5}$

Step-by-step explanation:

Given,

$\frac{2}{5} - 3$

This is a Subtraction of fraction of Algebra.

$\frac{2}{5} - 3$

$= \frac{2}{5} - \frac{3}{1}$

We are doing LCM of 5 and 1.

LCM of 5 and 1 is 5.

So,

$\frac{2}{5} - \frac{3}{1} \\ = \frac{2 - 3 \times 5}{5} \\ = \frac{2 - 15}{5} \\ = \frac{ - 12}{5} \\ = ( - \frac{12}{5} ) \\ = - 2 \frac{2}{5}$

One similar problem,

$\frac{5}{8} - \frac{7}{4}$

LCM of 8 and 4 is 8

So,

$\frac{5 - 7 \times 2}{8} \\ = \frac{5 - 14}{8} \\ = \frac{ - 9}{8} \\ = - \frac{9}{8} \\ = - 1 \frac{1}{8}$

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,

1) https://brainly.in/question/13024124

2) https://brainly.in/question/1169549