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OpenStudy (anonymous):
-15+6(-3b+4)+9(2b-1)
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Directrix (directrix):
0
OpenStudy (campbell_st):
take it bit by bit.. 6(-3b + 4) = -18b + 24 9(2b -1) = 18b - 9 combining -15 -18b +14 +18b - 9 collect like terms.... I'll leave that for you
OpenStudy (campbell_st):
oops 24 not 14
Directrix (directrix):
-15+6(-3b+4)+9(2b-1) = -15 -18b + 24 + 18b -9 = 0
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