Subtract (a’ + b² + 2ab) from (a’ + b² – 2ab)
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The difference of two like terms is a like term whose coefficient is the difference of the numerical coefficient of the two like terms.
∴The required difference =(a2+b2+2ab)−(a2+b2−2ab)
=a2+b2+2ab−a2−b2+2ab
Rearranging and collecting like terms
=(1−1)a2+(1−1)b2+(2+2)ab
=(0)a2+(0)b2+(4)ab
=4ab
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