Expand the formula (a-b)2
Given: Expand the formula (a-b)2
(a–b)2=a2–2ab+b2
Solution
(a–b)2 let us derive the equation
Let us start with LHS: (a–b)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=a2–2ab+b2
What is the expanded form of (a + b)2