(2a ²+9) (2a²+5)
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(2a^2+9) (2a^2+5)
=4a^2 +2a^2 ×5 + 2a^2 ×9 + 9×5
=4a^2 +10a^2 +18a^2 +45
=4a^2 +28a^2 +45
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