Question

3x-13=8 the value of x-1 is?

Answer 1

6 is the anwer
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Answer 2

Answer:

Required value of (x-1) is 6.

Step-by-step explanation:

Here given equation is $3x - 13 = 8.....(1)$

This is a problem of Algebra.

First we want to find value of x.

So now we need to solve equation (1),

From equation (1),

$3x - 13 = 8$

We are separating variable and constant part,

$3x = 8 + 13$

We are adding 8 and 13,

$3x = 21$

$x = \frac{21}{3}$

Dividing 21 by 3,

$x = 7$

Hence value of x is 7.

So,

$(x - 1) = (7 - 1) = 6$

Required value of (x-1) is 6.

Some important Algebra formula,

(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)