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If p(1/q) = -1, then which of the following is NOT necessarily true? (a) p+q=0 (b) p-q=2p (c) pq=-p^2 (d) p^2 + q^2 = 2p^2 (e) p= -1/q
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(b) p-q=2p
how'd u get that?
p(1/q) = -1 so p=-q replace all the p's above with -q and see if you get equality
i do get equality
shouldn't on all of them..one of them is bad
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which one?
I can't just give the answer
notice that b) is ok p-q=2p -q-q=2(-q) -2q=-2q
what do you get for e
i chose that one as the answer but wasn't sure
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p= -1/q -q=-1/q this is not always true...if q=2 then -2=-1/2
so the answer is (e)
thank you :)
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