3.Simplify : ( 5x + 3a ) ( 5x – 3a) + ( 2x – 5a ) ( 2x – 5a)
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= ( 5x + 3a ) ( 5x – 3a) + ( 2x – 5a ) ( 2x – 5a)
= 25x2-9a2+4x2-10ax-10ax+25a2
= 29x2+16a2-20ax
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