SOLUTION: How to you factor completely: 100b squared + 140b + 49

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Question 862311: How to you factor completely:
100b squared + 140b + 49
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+100b%5E2+%2B+140b+%2B+49+
+%28+10b+%29%5E2+%2B+2%2A10%2A7%2Ab+%2B+7%5E2+
+%28+10b+%2B+7+%29%5E2+
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Note that if I say:
+10b+=+x+
+7+=+y+
Then I have:
+x%5E2+%2B+2%2Ax%2Ay+%2B+y%5E2+=+%28+x+%2B+y+%29%5E2+
+%28+x+%2B+y+%29%5E2+=+%28+10b+%2B+7+%29%5E2+
which is the answer I got