Simplificatation, evaluation, linear equations, linear graphs, linear inequalities, basic word problems, etc.
- Posts: 8
- Joined: Sat Oct 29, 2011 7:42 pm
if p2+q2= 25 and 2pq=10, what is (p-q)2?
i dont get this...the answer is b) and i guessed c).
i only know that pq=5 and possible values for the p and q in p2+q2= 25 are p=4 and q=3 or vice versa.
- Posts: 133
- Joined: Sun Feb 22, 2009 11:12 pm
i'm surprised nobody answered this. you need to use the perfect squares formula: (p-q)^2 = p^2-2pq+q^2
then p^2+q^2-2pq = 25-10 = 15 = (p-q)^2
i think all the answers are wrong
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