dhlee922 wrote:
i'm still a little confused by the answer choices.
is it because the question stem equates to B=0 OR A=C
so for answer choice A, A doesnt have to equal C because the B equaling 0 will just make the whole expression 0
but then for answer choice B, since B=0 OR A=C, since 1 or the 3 groups in parentheses will be 0, it will make the whole expression 0, therefore B must be true?
is it because the question stem equates to B=0 OR A=C
so for answer choice A, A doesnt have to equal C because the B equaling 0 will just make the whole expression 0
but then for answer choice B, since B=0 OR A=C, since 1 or the 3 groups in parentheses will be 0, it will make the whole expression 0, therefore B must be true?
Yes, for A, if b=0, then a may or may not equal to c.
As for B, since b=0 or a=c (a-c=0), then b(a-c)(a+c)=0 must be true, since either the first or the second multiple (or both) is 0.
Hope it's clear.