A square minus b square is equal to
Asked by admin @ in Math viewed by 349 People
What is the formula of a square minus b square
Answered by admin @
A2-b2=(a+b)(a-b).
Let's prove this by opening the brackets:
a2-b2=a*a+a*-b+b*a+b*-b.
a2-b2=a2-ab+ba-b2.
ab is the same as ba:
a2-b2=a2-ab+ab-b2.
ab and ba get cancelled:
a2-b2=a2-b2.
Hence proved that the identity a2-b2=(a+b)(a-b).
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