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Question
Evaluate: (1.6x + 0.7y) (1.6x − 0.7y)
Solution
(1.6x + 0.7y) (1.6x − 0.7y)
= (1.6x)2 − (0.7y)2 ......[ ∵ (a − b) (a +b) = a2 − b2]
= 2.56x2 − 0.49y2
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