Maths Quiz: Finding Wrong Step in the Proof of 2 = 1

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Maths Quiz

What is wrong with this proof of 2 = 1?

If  a = b
⇒ a2 = ab
⇒ a2  - b= ab - b2
⇒ ( a + b) (a - b) = b(a - b)
⇒ a + b = b
⇒ b + b = b
⇒ 2b  = b
⇒ 2 =  1

 

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