Saturday

July 26, 2014

July 26, 2014

Posted by **renee** on Sunday, February 24, 2013 at 7:16pm.

- algebra -
**bobpursley**, Sunday, February 24, 2013 at 7:59pmfirst one:

(x-7)(x+7)/(2x-1)

well all x are ok, except for x=1/2: division by zero is not defined.

range:

consider look at the transition of sign changes: at x=-7, x=7, and x=1/2

at x=-8, signs are -*-/- or negative

at x=-6, signs are -*+/- or positive

at x= .55, signs are -*+/+ or negative

at x=8, signs are +*+/+ or positive

so the range is from -inf to +inf

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