2bsquare+20b-2400=0
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Answer:
2b² + 20b - 2400 = 0
2(b² + 10b - 1200) =0
b² + 10b - 1200 = 0
b² +40b - 30b - 1200 = 0
b(b +40) - 30(b+40) = 0
(b + 40)(b -30) = 0
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