# Thread: Really need help

1. ## Really need help

1.I need to evaluate (x+x^3)dx with limits 2 and 1

ii. estimate the above integral using the trapezium rule using 5 strips

2.i need to use the trapezium rule with 4 strips to estimate root(1+x^2) with limits of 4 and 0

3.the gradient function is dy/dx= 1/x^2 - xrootx

4.I need to find the stationary point of the graph y= (1/x) + (1/x^2) - (1/x^3) and need to determine their natures of each

I need help with these 4 please. Dont think you have to answer them all, but i do need all the answers and working out Thanks

Need replies ASAP

2. ## Well

What have you tried so far and what has not worked?
Are you familiar with the method you are intended to use?
What is causing you headache about these exercises?
Post some work and I´ll help...

3. Originally Posted by Notsogoodatmaths
1.I need to evaluate (x+x^3)dx with limits 2 and 1
You want to evaluate the integral $x+x^3$ between 1 to 2?

ii. estimate the above integral using the trapezium rule using 5 strips

2.i need to use the trapezium rule with 4 strips to estimate root(1+x^2) with limits of 4 and 0

3.the gradient function is dy/dx= 1/x^2 - xrootx what do you want to do here? Evaluate the integral with the trapezium method?

4.I need to find the stationary point of the graph y= (1/x) + (1/x^2) - (1/x^3) and need to determine their natures of each
The stationary point means: The point where the derivative is zero?

I need help with these 4 please. Dont think you have to answer them all, but i do need all the answers and working out Thanks

Need replies ASAP
No worries will fx this in notime =)

4. Originally Posted by Henryt999
No worries will fx this in notime =)
Thats just what im given in the question. its not all the trapezium rule

would appreciate it if you could write a step by step working out of the question. the question i have written down is exactly what it says on the paper