Question

Which expression is equivalent to the area of metal sheet required to make this square-shaped traffic sign?

4x2 − 1
4x2 + 1
4x2 + 4x − 1
4x2 − 4x + 1

Answer 1

I believe it's the second option: 4x^2 +1

You basically just square it.

2 squared is 4
x squared is x^2\
an -1 squared it +1

Answer 2

area is length * width

(2x-1)(2x-1) = 2x*2x -2x -2x + 1 = 4x2 - 4x + 1

don't forget the "double product" in the middle!!