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Question
Use the direct method to evaluate :
(3x2+5y2) (3x2−5y2)
Sum
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Solution
Note: (a+b) (a−b) = a2 − b2
(3x2+5y2) (3x2−5y2) = (3x2)2 − (5y2)2
= 9x4 − 25y4
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