Question

write the expression 5x² - 4 - 3x² +6x+8+5x-13 in its simplified form .  Find its value when x=-2

Answer 1

5x^2-4-3x^2+6x+8+5x-13
combine like terms
5x^2-3x^2+6x+5x-4-13+8
=2x^2+11x-9
substituing x=-2
=2(-2)^2+11(-2)-9
=8-22-9
=-23
hence the answer is -23

Answer 2

• The simplified form is 2x² + 11x - 9

• The value of the expression when x = - 2 is - 23

Given :

The expression 5x² - 4 - 3x² + 6x + 8 + 5x -13

To find :

• The simplified form

• The value of the expression when x = - 2

Solution :

Step 1 of 3 :

Write down the given expression

Here the given expression is

5x² - 4 - 3x² + 6x + 8 + 5x -13

Step 2 of 2 :

Simplify the given expression

5x² - 4 - 3x² + 6x + 8 + 5x -13

= 5x² - 3x² + 6x + 5x - 13 - 4 + 8

= 2x² + 11x - 9

Step 3 of 3 :

Find the value of the expression when x = - 2

The value of the expression when x = - 2

= 2 × ( - 2)² + 11 × ( - 2) - 9

= 8 - 22 - 9

= - 23

━━━━━━━━━━━━━━━━

Learn more from Brainly :-

$1.$ Find the value of the expression a² – 2ab + b² for a = 1, b = 1

https://brainly.in/question/28961155

2. to verify algebraic identity a2-b2=(a+b)(a-b)

https://brainly.in/question/10726280

#SPJ3