Question
Simplify the following expression: (5x + 7) 2  + (5x – 7) 2 .
Solution
(5x + 7) 2  + (5x – 7) 2 = 25x 2  + 49 + 70x + 25x 2  + 49 – 70x
= 50x 2 Â + 98
= 2(25x 2 Â + 49)
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