Question

2x + 4=8

so what does x=

Answer 1

realy need help

Answer 2

To solve an equation like this one, look at the operations done to x and undo them in the reverse order.
If you had a number to put in for x, to calculate the left side you'd first multiply the number by 2 then you'd add 4 to it.
You want to undo all that, so start with the last operation, and undo it.
How do you undo + 4? You subtract 4 from both sides.
Then how do you undo 2 times? You divide both sides by 2.

Answer 3

Start by subtracting 4 from both sides. Can you write what you get?

Answer 4

umm lets see

Answer 5

Which two numbers do I subtract 4 from?

Answer 6

This is how you do it:
2x + 4 - 4 = 8 - 4
I subtracted 4 from both sides. You see -4 on both sides.
Now what is 2x + 4 - 4?
What is 8 - 4?

Answer 7

4

Answer 8

so that means that x=4

Answer 9

2x +4 - 4 = 2x
8 - 4 = 4
So you get
2x = 4

Answer 10

thank you

Answer 11

Now you need to do the next step which is to divide both sides by 2, since the x is being multiplied by 2.
2x/2 = 4/2
What is 2x/2?
What is 4/2?

Answer 12

2x/2 = x
4/2 = 2
So x = 2
Now check
2x + 4 = 8, plug in 2 for x and calculate:
2(2) + 4 = 8?
4 + 4 = 8?
8 = 8 Checks, so x = 2 is the solution.

Answer 13

ok