Question 137248: how do i solve: (x+7)(x-6)(x-8)<= 0
the answer choices are
a) x<= -7 or 6<=x<=8
b) x<= -7 or x<= 8
c) -7<=x<=6 or x>=8
d) -7<=x<=8 Answer by oscargut(2103) (Show Source):
You can put this solution on YOUR website! sign of f(x)= (x+7)(x-6)(x-8) is
-----0++++0---0+++++
-7 6 8
(you put + at the right because the greatest term x^3 has coefficient 1>0 and you must change signs at the roots)
so option a) is the correct
