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(2a 2 + 9) (2a 2 + 5)= [2a 2 ] + (9 + 5)2a 2 + 9 x 5 = 4a 4 + 14 x 2a 2 + 45 = 4a 4 + 28a 2 + 45

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(2a²+ 9) (2a²+ 5)= [2a²] + (9 + 5)2a²+ 9 x 5
= 4a⁴ + 14 x 2a²+ 45
= 4a⁴ + 28a²+ 45

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