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Maths
A Level

Consider f(x)=x/(x^2+1). Find the derivative f'(x)

To answer this question we need to decide which differentiation rule to use . The quotient rule looks like the obvious choice, so lets try that. If f(x)=u(x)/v(x) (being careful that v(x) is not zero anyw...

JH
Answered by Jack H. Maths tutor
4388 Views

How do I find the roots of a quadratic equation?

A quadratic equation is one that contains an x^2 term that has a non 0 coefficient, There are three basic methods for solving a quadratic equation; factorising, completing the square, and the quadratic fo...

MC
Answered by MacGregor C. Maths tutor
4278 Views

Express 8/((root3) -1)) in the form a(root3) +b, where a and b are integers.

You would multiply both numerator and denominator by the expression (root3 +1)/(root3 +1). This expression is equal to 1 hence the original expression remains unchanged. The new expression is now (8(root...

SK
Answered by Shubham K. Maths tutor
6950 Views

What is the chain rule?

The chain rule is a type of differentiation used when you are differentiating a function of a function e.g. (2x+5)^3, or e.g.2. (x^2 + 5)^0.5.
Firstly you replace one function with u. You then diffe...

AS
Answered by Alice S. Maths tutor
3586 Views

The curve C is paramterised by the equations: x = 5t + 3 ; y = 2 / t ; t > 0 Find y in terms of x and hence find dy/dx

x = 5t + 3 -> x - 3 = 5t -> (x - 3) / 5 = t
y = 2 / t -> y = 2 / ((x - 3) / 5) -> y = 10 / (x - 3) dy/dx = d/dx (10 / (x - 3)) -> dy/dx= -10...

DC
Answered by Dylan C. Maths tutor
4032 Views

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