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definte integrals
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July 4th, 2009, 07:27 AM
tom@ballooncalculus
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You are plugging the limits into your (correct) integral expression, are you?
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![\int_4^6 (7x - 3x^3) dx = \large{[}\frac{7}{2}x^2 - \frac{3}{4}x^4\large{]}_4^6](http://www.mathhelpforum.com/math-help/latex2/img/3bfadd3d359e25511f6c2101f10d2663-1.gif "\int_4^6 (7x - 3x^3) dx = \large{[}\frac{7}{2}x^2 - \frac{3}{4}x^4\large{]}_4^6")
![= [\frac{7}{2}6^2 - \frac{3}{4}6^4] - [\frac{7}{2}4^2 - \frac{3}{4}4^4]](http://www.mathhelpforum.com/math-help/latex2/img/3d93bfa4377f7da22dd6a2fae2064152-1.gif "= [\frac{7}{2}6^2 - \frac{3}{4}6^4] - [\frac{7}{2}4^2 - \frac{3}{4}4^4]")