what number must be added to x2 6x make the result, Factors, Mathematics (O-Level)

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Question:What number must be added to (`x^2` +6x) to make the result a perfect square?

Answer (`x^2` + 6x)
=`x^2` + `2.x.3` + `3^2` - 9
=`(x+3)^2` - 9               [here `(x+3)^2` is perfect square ]

`:.`  to make (`x^2` +6x) perfect , 9 must be added

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What number must be added to (`x^2` +6x) to make the result a perfect square?

Question:What number must be added to (`x^2` +6x) to make the result a perfect square?

Answer (`x^2` + 6x) =`x^2` + `2.x.3` + `3^2` - 9 =`(x+3)^2` - 9 [here `(x+3)^2` is perfect square ] `:.` to make (`x^2` +6x) perfect , 9 must be added