Integrate 1/(5-2x) for 3≤x≤4

You must be careful with these sorts of questions as although 1/(5-2x) is equivalent to (5-2x)^-1, when you integrate you would add one to the power and divide by the new power. But if you were to add one to (5-2x)^-1 you would get zero. Therefore, when you are integrating a fraction with a linear expression as the denominator (meaning a denominator where the greatest power of x is 1), it integrates to the natural logarithm (ln) of the denominator, multiplied by the differential of the denominator.So in this example, 1/(5-2x) would integrate to[ln(5-2x)/(-2)] (as 5-2x differentiates to -2) for 3≤x≤4Then you would sub in the limits of x and subtract as usual:ln(5-2(4))/(-2) - ln(5-2(3))/(-2)= -1/2ln(5-8) - -1/2ln(5-6) Remeber that you cannot take the ln of a negative number, so it is best to write it as: = -1/2ln|-3| - -1/2ln|-1|= -1/2ln(3) - -1/2ln(1)ln(1)=0 so our answer is-1/2ln3  

Answered by Emily-Louisa S. Maths tutor

6121 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Find the gradient of the curve with the equation y = x^3+7x^2+1 at x=2


Use logarithms to solve the equation 2^(5x) = 3^(2x+1) , giving the answer correct to 3 significant figures


When using the addition rule in probability, why must we subtract the "intersection" to find the "union" with the Addition Rule?


A cannonball is fired at an angle of 30 degrees and a velocity of 16 m/s. How long does it take (to 2 significant figures) for the cannonball to reach the ground?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences