Question

4. Brad wants to find tree consecutive whole numbers that add up to 81. He wrote the equation (n -1) + n + (n + 1) = 81. What does the n stand for?

Answer 1

Answer:

the n stands for the no. of trees

here

(n-1),n&(n+1)

are consicutive no.

here n is the second consecutive no.

then

3n=81

n=27

then

trees are 26,27,28

ok

follow me

guys

Answer 2

Answer:

The n stands for 27.

Step-by-step explanation:

Given,Brad wants to find tree consecutive whole numbers that add up to 81.

Let three consecutive numbers be (n-1),n and (n+1).

It is also given,

$(n - 1) + n + (n + 1) = 81$

We are removing first bracket,

$n - 1 + n + n + 1 = 81$

We are separating variable and constant part,

$n + n + n = 81 + 1 - 1$

$3n = 81 \\ n = \frac{81}{3} \\ n = 27$

Required value of n is 27.

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