Posted by vishal on Tuesday, May 31, 2011 at 1:14pm.
Recognize the perfect square form, a^2+2ab+b^2 = (a + b)^2
4n^2 + 28n + 49
(2n + 7)^2
In google type :
wolfram alpha
When you see list of results click on:
Wolfram Alpha: Computation Knowledge Engine
When page be open in rectangle type:
4n^2+28n+49
and click option =
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