Question

Simplify these expression and find its value when x= 3

(a). 2x - 5- x + 9. ( b.) 10- 3x +4x+4
plz answer step wise step​

Answer 1

Given

• x = 3

_________________________

To Find

• 2x - 5 - x + 9
• 10 - 3x + 4x + 4

_________________________

Solution

According to the question, we are asked to use the method of simplifying and then finding the value of the equation when x = 3. So, let's solve the given expressions.

a) 2x - 5 - x + 9

Step 1: Combine like terms.

⇒ 2x - 5 - x + 9

⇒ 2x - x - 5 + 9

⇒ x + 4

Step 2: Substitute the value of 'x' and solve.

⇒ x + 4

⇒ 3 + 4

⇒ 7

∴ 2x - 5 - x + 9 = 7 when 'x' = 3

_________________________

b) 10 - 3x + 4x + 4

Step 1: Combine like terms.

⇒ 10 + 4 - 3x + 4x

⇒ 14 + x

Step 2: Substitute the value of 'x' and solve.

⇒ 14 + x

⇒ 14 + 3

⇒ 17

∴ 10 - 3x + 4x + 4 when 'x' = 3

_________________________

Answer 2

Answer: (a) = 18 , (b) = 27

Step-by-step explanation:

(a). 2x - 5 - x + 9

     = 2*3 - 5 - 3 + 9

     = 6 - 8 + 9

     = 6 + 1

     = 7

(b). 10 - 3x + 4x + 4

      = 10 - 3*3 + 4*3 + 4

      = 10- 9 + 12 +4

      = 1 + 12 + 4

      = 13 + 14

      = 27