(a2+5) (a2-4)
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(a+b) (a-b) = a^2 b^2
(a^2 +5) (a^2 - 4) = 5^2 4^2
= (25) (16)
=400
(a^2 +5) (a^2 - 4) = 5^2 4^2
= (25) (16)
=400
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