b^2 +6bc -55 c^2 =(b +3c)^2 - 64c^2 = (b +3c -8c)(b+3c +8c) = (b-5c)(b+11c)
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b^2 +6bc -55 c^2 =(b +3c)^2 - 64c^2 = (b +3c -8c)(b+3c +8c) = (b-5c)(b+11c)