15x^3 – 38x^2 – 23x + 6 by 3x + 2
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Thoughtfully split the expression at hand into groups, each group having two terms :
Group 1: 38x3+37x2
Group 2: 2x5+15x4
Group 3: 6x-18
Pull out from each group separately :
Group 1: (38x+37) • (x2)
Group 2: (2x+15) • (x4)
Group 3: (x-3) • (6)
Looking for common sub-expressions :
Group 1: (38x+37) • (x2)
Group 3: (x-3) • (6)
Group 2: (2x+15) • (x4)
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