Question

Did I do something wrong ?

Answer 1

Answer: 0

Work Shown:

`16 - 4^2 + 4 - 2^2\\\\16 - 16 + 4 - 4\\\\0 + 0\\\\0\\\\`

In the second step, the
`4^2` turns into 16 because
`4^2 =4*4 = 16`. Squaring a number means you multiply it with itself. So that's also why
`2^2 = 2*2 = 4`

Think of a 4 by 4 square with area 16; same goes for a 2 by 2 square of area 4.