X^2-16=0 solve for all real values of x

Hi there! Use the difference of two squares formula below:

You need to know that what number times itself and get 16. 16 comes from 4×4 or 4².

Then,

Solve the equation for all real values of x.

If you don't like using a formula. You can do this:

If you remember the square root well, the square root of 16 is 4×4. Pull out the two 4's and thus the square root of 16 is 4.

For the square both sides method above (second method), we can define that:

Answer

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