What is the value of the expression 9 + 4n - 1 when n = 3?

The value of expression 9 + 4n - 1 is 20 when n = 3. The detailed solution for the same is added below:

Question: What is the Value of Expression 9 + 4n - 1 when n Equals 3?

Given Expression:

• 9 + 4n - 1 
• n = 3

We will put the value of n = 3 in above given expression:

=  9 + 4n - 1 

= 9 + 4(3) - 1 

= 9 + 12 - 1

= 21 - 1 = 20

So the value of expression is 20

Similar Questions

Question 1: What is the value of the expression n² + 5n - 5 when n equals 2?

Solution:

Given Expression:  

• n² + 5n - 5
• n = 2

We will put the value of n = 2 in above given expression:

=  n² + 5n - 5

=  2² + 5(2) - 5

= 4 + 10 - 5

=  14 -5  = 9

So the value of expression is 9

Question 2: What is the value of the expression 4x + 7  when x equals 3?

Solution:

• Given Expression: 4x + 7 
• x = 3

We will put the value of n = 2 in above given expression:

=  4x + 7 

=  4(3) + 7 

= 12 + 7 =  19

So the value of expression is 19

Question 3: What is the value of the expression (n + 2)² when n equals -2?

Solution:

Given Expression: (n + 2)²

n = -2

We will put the value of n = - 2 in above given expression:

=  (n + 2)²

By using algebraic expression, (a + b)² = a² + 2ab + b²

=  n² + 2(n)(2) + 2²

Now put the value of n= -2 in above expression 

= (-2)² + 2(-2)(2) + 4

=  4 + (-8) + 4

= 4 - 8 +4

=  8 - 8 = 0

So the value of expression is 0

Question 4: What is the value of the expression 20 - 4n when n equals 4?

Solution:

• Given Expression: 20 - 4n
• n = 4

We will put the value of n = 4 in above given expression:

= 20 - 4n

= 20 - 4(4)

= 20 - 16 =  4

So the value of expression is 4

Question 5: What is the value of the expression x²(5 - x) when x equals 3?

Solution:

• Given Expression: x²(5 - x)
• x = 3

We will put the value of x = 3 in above given expression:

=  x²(5 - x)

=  5x² - x³

= 5(3)² - 3³

=  5(9) - 27

= 45 - 27 = 18

So the value of expression is 18

Question 6: What is the value of the expression 3x + 4y + 20 when x = 3 , y = 2?

Solution:

• Given Expression: 3x + 4y + 20
• x = 3, y = 2 

We will put the value of x = 3 , y = 2 in above given expression :

=  3x + 4y + 20

= 3(3) + 4(2) + 20

= 9 + 8 + 20

=  17 + 20 =  37

So the value of expression is 37