S4 (-3x+4) dx 1
that is the sum of two integrals -3 x dx and 4 dx the first one is - (3/2) x^2 at 4 - at 1 = -(3/2)(16 - 1) = -(3/2) 15 = -45/2 the second one is 4 (4-1) = 12 so I get -45/2 + 24/2 = -21/2
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