If AB2 = - 6, then the value of - AB (a2b5-ab3-b) is______ .

If AB2 = - 6, then the value of - AB (a2b5-ab3-b) is______ .

-AB (a2b5-ab3-b), = - AB2 (a2b4-ab2-1), when AB2 = - 6, the original formula = - (- 6) [- 6) 2 - (- 6) - 1] = 246