Square of difference

Formula

$$(a-b)^2=a^2-2ab+b^2$$

Example

                Example 1:|
$(a-2)^2 = a^2 - 2\cdot a \cdot 2 + 2^2 = a^2 - 4a + 4$
Example 2:|
$A
(3x-5y)^2 &= (3x)^2 - 2 \cdot 3x \cdot 5y + (5y)^2\\ &= 9x^2 - 30xy + 25y^2
A$
            

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