Question

Simplify the following expressions and then find the numerical values for x = -2.

3(2x – 4) + x2 +15



Answer it fast
No spam please

​

Answer 1

★ Given:

The expression 3(2x – 4) + x² +15.

Numerical value of x = -2

★ To Find:

The simplification of the expression.

The answer of the expression when x = -2 is applied.

★ Solution:

Part 1 - Simplification

$\sf{3\times(2x-4)+x^2+15}$

→ Opening the brackets

$\sf{=(3\times2x)-(3\times4)+x^2+15}$

→ Multiplying the terms

$\sf{=6x-12+x^2+15}$

→ Adding the like terms

$\sf{=6x-3+x^2}$

Simplified form:

6x - 3 + x²

Part 2 - Substituting the value of x = -2

6x - 3 + x² where x = -2

$\sf{=(6\times-2)-3+(-2)^2}$

$\sf{=-12-3+4}$

$\sf{=-11}$

Answer of the expression:

-11

★ Final Answers:

Part 1 = Simplification = 6x - 3 + x²

Part 2 = Value of the expression = -11

Answer 2

The expression 3(2x – 4) + x² +15.

Numerical value of x = -2  

The answer of the expression when x = -2 is applied.

Part 1 - Simplification  

Open the brackets  

Multiply the terms  

Add the like terms

 

Simple  form:

6x - 3 + x²

Part 2 - Substituting the value of x = -2

6x - 3 + x² where x = -2  

   

Simplification = 6x - 3 + x²

Value of the expression = -11