(2x-y)^2

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Use FOIL.

F: first

O: outside

I: inside

L: last

(2x - y)^2

(2x - y)(2x - y)

F: 2x * 2x = 4x^2

O: 2x * -y = -2xy

I: -y * 2x = -2xy

L: -y * -y = y^2

Add together.

F + O + I + L

4x^2 + (-2xy) + (-2xy) + y^2

Simplify by adding the two middle terms.

**4x^2 + (-4xy) + y^2**

Also correct:

**4x^2 - 4xy + y^2**

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