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Mathematics 8 Online
OpenStudy (anonymous):

COMPLETE z2 + 9z – 90 = (z – 6)(z + ?)

OpenStudy (mathhelp346):

90/6=15

OpenStudy (aravindg):

15

OpenStudy (aravindg):

product of the constants must be 90 ie 6*x=90 x=15

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