If a ≠ b , and ab ≠ 0, then when a is replaced by 1 a and b is replaced by 1 b everywhere in the expression ( a + b ) ( a − b ) , the resulting expression is equal to Options: A . &nbsp−(a+b)(a−b) B . &nbsp(a+b)(a−b) C . &nbsp(a−b)(a+b) D . &nbsp(b−a)(a+b) E . &nbsp118

Answer: Option A : A ( a + b ) ( a − b ) = − ( a + b ) ( a − b )

If a ≠ b, and ab ≠ 0, then when a is replaced

Question

If a

\neq

b, and ab

\neq

0, then when a is replaced by

\frac{1}{a}

and b is replaced by

\frac{1}{b}

everywhere in the expression

\frac{(a + b)}{(a - b)}

, the resulting expression is equal to

Answer: Option A
:
A

\frac{(a + b)}{(a - b)} = - \frac{(a + b)}{(a - b)}

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