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velox_xox
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Homework Statement
Simplify. (p4 - q4)/(p + q)2 ÷ 1/(p2 + q2)
Answer: (p - q)/(p + q)
Homework Equations
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The Attempt at a Solution
Transformed it to a multiplication problem.
(p4 - q4)/(p + q)2 X (p2 + q2)/1
Difference of the squares in the numerator of the first expression:
(p2 + q2)(p2 - q2)/(p + q)2 X (p2 + q2)/1
Difference of the squares (once more) in the numerator of the first expression:
(p2 + q2)(p + q)(p - q)/(p + q)2 X (p2 + q2)/1
Simplified the (p +q) from the numerator and denominator of the first equation:
(p2 + q2)(p -q)/(p + q) X (p2 + q2)/1
Simplified the (p2 + q2) from the numerators of both expressions:
(p - q)/(p + q)
My question is with the part. Is that proper form? A.k.a. Did I not bend the rules of algebra to get the correct answer? And if so, can someone give example of when simplifying both numerators is okay or not okay?
Thank you!
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