Question:what number must be added to (`x^2` -18x) to make the result a perfect square?
Answer (`x^2` -18x) =`x^2` - 2 . x .9 +`9^2` - 81 =`(x-9)^2` - 81 [ here `(x-9)^2` is perfect squire ] `:.` to make (`x^2` - 18x) perfect , 81 must be added
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what number must be added to (`x^2` -18x) to make the result a perfect square?