SOLUTION: (sub subject is Factoring) solve {{{49a^2-56a+16=0}}} please justify your answer thank you

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Question 453363: (sub subject is Factoring)
solve 49a%5E2-56a%2B16=0
please justify your answer thank you
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
49a%5E2-56a%2B16=0

%287a%29%5E2-2%2A7a%2A4%2B%284%29%5E2
This is similar to the identity
%28a%2Bb%29%5E2=a%5E2%2B2ab%2Bb%5E2
%287a%2B4%29%5E2