To solve x+2 =? requires that there is something on the right hand side of the equation. Perhaps this is
`x+2 = 0`
Note how we have isolated the x (got it by itself). If there was another value on the right side, for example, 1, we would have `x+2=1`
`therefore x= 1-2` ` `
The graph of the straight line x+2=0 (see black line) and x+2=1 (see red line)follows :
Ans: x=-2 when x+2=0
Assuming the question mark represented a number, then x will be 2 subtracted from the question mark. 2 is being subtracted because the number is moved to the other side of the equal sign so changes its sign from positive to negative.
When there is no number after the equal sign and it asks to solve, it can be assumed that the number is 0:
x=-2. This is the final answer.
We should first look at the problem as x + 2 =0
We are trying to solve for x, and in order to do that we need to get x alone. The 2 being added is standing in the way of the x being alone, so we need to get rid of it, by doing the opposite of adding which is subtracting 2.
x + 2 - 2 = 0 - 2
x = -2