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Maths
A Level

How would you differentiate 3x^4 - 2x^2 + 9x - 1

First we follow the "times by the power and take one from the power" rule. This is the easiest way to remember how to differentiate anything. 

So (3x4)x(4-1) -(2x2)x(2-1)<...

Answered by Cathy E. Maths tutor
2815 Views

Integrate the following expression with respect to x by parts: (2*x)*sin(x)

The integration by parts formula: S:udv/dx = uv -  S:v*du/dx, where S: means "Integral of with respect to x" 

Let 2*x be u and sin(x) be dv/dx

So du/dx =2 and v= -cos(x)

Answered by David P. Maths tutor
2800 Views

When I integrate by parts how do I know which part of the equation is u and v'?

To determine which function is your u value in the by parts equation, you can use the acronym LATE to find the order of precedence for this value. LATE stands for: Logarithmic functions Arithmetric functi...

Answered by Ben A. Maths tutor
2821 Views

A car is moving on an inclined road with friction acting upon it. When it is moving up the road at a speed v the engine is working at power 3P and when it is moving down the road at v the engine is working at a power P. Find the value of P.

Incline is at θ where sin θ = 1/20 and mass of the car is 800kg and v is 12.5 m/s

Up the road: Power = Fv                              F = R + (800g)/20

                            ...

Answered by Jonathan M. Maths tutor
2785 Views

Integrate x*ln(x)

Let u = ln(x) and dv/dx = x

Thus du/dx = 1/x and v = x2/2

Using the formula:

Integral of udv/dx = uv - Integral of v*du/dx<...

Answered by Anindita G. Maths tutor
3790 Views

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