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Posted 9 years ago

Numerical Integral, Integral[1/(7.82x+11.6x^(91/80) + 34.14x^(91/60), {x, 111, \infty} ] Out[1] = -11.2317+0.777712 ?

What is the output ? namely, out[1] = -11.2317 ,or out[1] = 0.777712 ?

POSTED BY: Ling Zhengqiu

At some point you've lost bracket in yours integral.On the assumption your function is as below, then:

f[x_] := Rationalize[1/(7.82 x + 11.6 x^(91/80) + 34.14 x^(91/60))]

NIntegrate[f[x], {x, 111, Infinity}, WorkingPrecision -> 50]

Out[1]= 0.0047720874548260654854177397600585533652154541290915.

POSTED BY: Mariusz Iwaniuk
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