Posted by **JT** on Monday, July 19, 2010 at 9:16pm.

Why are these algebraic expressions used and explain the logical error: Since a = b, then a2 = a * b

Subtract b2 from both sides a2 – b2 = a * b – b2

Factor both sides: ( a + b )( a – b ) = b(a – b )

Divide both sides by ( a – b)

( a + b ) = b

Since a = b,

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