SOLUTION: please help me solve this question {{{ b^4-8b^2+4 }}} this is factor completely not radical

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Question 639415: please help me solve this question +b%5E4-8b%5E2%2B4++
this is factor completely not radical
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
+b%5E4-8b%5E2%2B4++
take difference of sqrt of end terms and square:
%28b%5E2-2%29%5E2
%28b%5E4-4b%5E2%2B4%29-4b%5E2
%28b%5E2-2%29%5E2-%282b%29%5E2
difference of 2 squares
%28b%5E2-2%29%2B%282b%29%28b%5E2-2%29-%282b%29