In other words, the unknown in the equation is called the solution of the equation.
The solution of an equation with only one unknown number is called the root of the equation.
X=2 is the solution and root of equation 2x-4=0.
Extended data We can see from the given figure that there are 9 * * * x on the left and 3 x on the right, and their sum is 9, so we can get a formula: x+3 = 9. We use the balance to explain here. The left of the equal sign is equivalent to the left of the balance, and the right of the equal sign is equivalent to the right of the balance. We use a kind of equation: both sides of the equation add and subtract the same number at the same time, and the equal sign remains the same.
So subtract 3 from both sides at the same time to get X+3-3 = 9-3. Because what X is needed, you can subtract the known 3 on the left with the balance, leaving only X, so you have to subtract 3 and subtract 3 at the same time. Finally, you get X = 6.
Here we should understand the difference between the solution of the equation and the solution of the equation. The solution of the equation is the concrete value of the unknown quantity, and the solution of the equation is the process of finding the solution of the equation.
Another very important point is the last step of solving the equation, testing. The test method is to bring the solution back to the original formula, that is, the left side of the equation = x+3 = 6+3 = 9 = the right side of the equation, which shows that our previous process of solving the equation is correct. Example 1 This paper studies the problem of solving the equation by using the first property of the equation: simultaneous addition and subtraction on both sides. Note: the solution and the equal sign should be aligned first.