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Question

Expand the formula (a-b)2


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Solution

Given: Expand the formula (a-b)2

(ab)2=a22ab+b2

Solution

(ab)2 let us derive the equation

Let us start with LHS: (ab)2

(a-b)2=(a-b)(a-b)

By distributive law

(a-b)2=(a-b)(a-b)=a(a-b)-b(a-b)=a2-ab-ab-b2 (Then again by multiplying each term )

(a-b)2=a22ab+b2


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