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Using contradiction mehtod , check the v...

Using contradiction mehtod , check the vality of the following statement : if n is a real number with ` n gt 3` thent `n^2 gt 9`

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Let n be a real number such that `n gt 3` and if possible let `n^2` be not greater than 9 .
Let `n^2=(9-a)` where a is a real number such that `a le 0`
but , this is a contradiction arises by assuming that `n^2` is not greater than 9 therefore `n^2 gt 9`
Hence , the given statement is valid:
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