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frasifrasi
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Book ex: We were given integral of [tex]\frac{sqrt of x + 4}{x}[/tex]/x dx
with the substitution u = sqrt{x + 4}
--> u^2 = x + 4 and x = u^2 - 4
--> dx = 2u du
and the int becomes 2*int of [tex]\frac{u^2}{u^2 - 4}[/tex]du
But how does it go from that to the next step:
2 int of 1 + [tex]\frac{4}{u^2 - 4}[/tex]du ?
with the substitution u = sqrt{x + 4}
--> u^2 = x + 4 and x = u^2 - 4
--> dx = 2u du
and the int becomes 2*int of [tex]\frac{u^2}{u^2 - 4}[/tex]du
But how does it go from that to the next step:
2 int of 1 + [tex]\frac{4}{u^2 - 4}[/tex]du ?
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