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z2 + 9z + 18 = z2 + 6z + 3z + 18 = z(z+6) + 3(z+6) = (z+6)*(z+3)
Z is equal to 6. Z+2=8 8-2=6 Z=6
z/6 = -5/12, cross multiply. z*12 =-5*6 z = -30/12 z= -5/2
(z - 8) / 6 = -4 Multiply both sides by 6: (z - 8) = -24 Add 8 to both sides: z = -16