2 Answers

2019 JAMB-UTME mathematics question 36

Posted by: 457 views

If S = (4t + 3)(t – 2), find ds/dt when t = 5secs.

  • A. 50 units per sec
  • B. 35 units per sec
  • C. 13 units per sec
  • D. 22 units per sec




We can resolve this problem with two different methods, whichever way results in the same answer.

Method 1 = carrying out the multiplication and expanding to remove the bracket, and then differentiating the result using normal differentiation formula before substituting t = 5secs to get our answer.

Method 2 = using product rule to differentiate and then substituting t = 5secs.

Here, we are going to use method 2,

Product rule states thus:

2019 JAMB-UTME mathematics question 36

Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is correct.
  3. C is incorrect.
  4. D is not the correct answer.


You may please note these/this:

  • Expanding the bracket and differentiating each unit will also give the same answer, you can choose whichever is convenient for you.

Use the questions and answer session to correct, express, and contribute your views.

You can also FREELY share this page with friends.

/ culled from 2019 JAMB-UTME mathematics question 36 /

Answer Question