Evaluate −8x+5−2x−4+5x when x=2 before and after simplifying.

Answer 1

To solve before simplifying:

plug in 2 for all the x values in the equation

-8x + 5 - 2x - 4 +5x

-8(2) + 5 - 2(2) - 4 + 5(2)

Following rules of operations, solve the multiplication terms first (the parentheses)

-8(2) + 5 - 2(2) - 4 + 5(2)

-16 + 5 - 4 - 4 + 10

then add or subtract the rest for the final answer!

-16 + 5 - 4 -4 +10 = -9

To solve after simplifying:

Combine like terms first

-8x + 5 - 2x - 4 + 5x

(-8x - 2x + 5x) + (5 - 4)

-5x + 1

plug in 2 for x and solve

-5x + 1

-5(2) + 1 = -9

Hope this helps :)

Answer 2

Hey!

To simplify you just need to plug in 2 for every x-value first! You will have:

-8(2) + 5 - 2(2) -4 + 5(2)

Simplify all the multiplication terms first (where the parentheses are) and then just work from left to right.

Hope this helps!