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Answer:
56 units
Step-by-step explanation:
[tex]\int\limits^4_2 {3x^2} \, dx\\ =\frac{3}{2+1}x^{2+1} |\limits^4_2 \\=x^3 |\limits^4_2\\=4^3-2^3\\=64-8\\=56[/tex]