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OpenStudy (anonymous):
2b^2+17b+21
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OpenStudy (campbell_st):
if you want it factorised multiply the coefficient of x^2 by the constant 2 x 21 = 42 find the factors of 42 that add to 17...... 14, 3 then \[((2x + 14)(2x+3))/2 = (2(x +7)(2x+3))/2 = (x+7)(2x+3)\]
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