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In the following 6 lines, it is given that a=ba=ba=b:
a2−b2=a2−ab⇒(a+b)(a−b)=a(a−b)⇒(a+b)=a⇒a+a=a⇒2a=a⇒2=1 { a }^{ 2 }-{ b }^{ 2 }= { a }^{ 2 }-ab\\ \\ \Rightarrow (a+b)(a-b) = a(a-b)\\ \\ \Rightarrow (a+b) = a\\ \\ \Rightarrow a+a = a\\ \\ \Rightarrow 2a = a\\ \\ \Rightarrow 2 = 1a2−b2=a2−ab⇒(a+b)(a−b)=a(a−b)⇒(a+b)=a⇒a+a=a⇒2a=a⇒2=1
Which line is wrong?
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