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Did I do something wrong ?

Did I do something wrong ?-example-1

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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.

User Wenjing
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