Question:Factorise `x^2` - `y^2` and hence evaluate `100^2` - `99^2`
Answer `x^2` - `y^2` =(x+y) (x-y) `:.` `100^2` - `99^2` =(100+99) (100-99) =199+1 =200
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Factorise `x^2` - `y^2` and hence evaluate `100^2` - `99^2`