for the first one determine where it is negative. Solve the equation by finding the zero's. (set each one x-4=0 etc). It looks like it's 4, 5 and 7 if they are all (x- -#'s) are your ZERO'S.Originally Posted by redGT
Key part
Now use the zero's of F to separate the real numbers into INTERVAL's (#,#) on a number line. (-inf,4),(4,5)(5,7)(7,inf) I believe..
Next choose a number on the number line (i.e 0, 4.5, 6,8) and find the value of f..F(0) = plug it in. Do this for each one. Remember its a number that's within that interval.
If it is NEGATIVE then that's part of your answer, postitive..it is not.
answer should be C...If it was >, then the positive intervals would be your
I did not check over it, nor hardly look at it, I did it in my head so do it yourself and make sure it's right
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