titby5vonnyjz
titby5vonnyjz
25-05-2016
Mathematics
contestada
Simplify p(p - q) - q(q - p).
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jcchen1229
jcchen1229
25-05-2016
p^2-pq-q^2+pq=
p^2-q^2=
(p+q)(p-q)=
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olemakpadu
olemakpadu
25-05-2016
p(p - q) - q(q - p). Multiply out.
p*p - p*q - q*q + q*p.
Note because of the minus before the bracket, the minus inside the bracket changes to +
p² - pq -q² + pq
p² - q² + pq - pq
p² - q² + 0
p² - q²
= p² - q²
I hope this helps.
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