Evaluate the expression 3.14(a2 + ab) when a = 3 and b = 4. (Input decimals only, such as 12.71, as the answer.) (4 points)
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3.14(a2 + ab)
= 3.14 (3^2+ 3×4)
= 3.14 (9+12)
=3.14×21
=65.94
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