Search our library of A Level questions

Top answers

All subjects

A Level

Express (3-5x)/(x+3)^2 in the form A/(x+3) + B/(x+3)^2

A needs to be multiplied up by x+3 to make the fraction have the same in denominator as the other expressions. Then you need to equate the numerators. 3 - 5x = A(x+3) + B
You can gain two simultaneou...

Answered by • Maths tutor

3124 Views

How does a simple reflex work?

A pain stimulus, for example, pressure from a pin, is sensed by a receptor, for example, pacinian corpuscle in the skin of the fingertip.This causes a change in shape of the receptor, so sodium ions diffu...

Answered by Tara S. • Biology tutor

3232 Views

Using Angola as an example, evaluate the view that MNCs play a positive role in the development of LEDCs. (25 marks)

Structure: Definition and IntroductionWhat is a Multi National Corporation? Define: Less Economically Developed Country --> characteristics (brief)First Point: Analysis, Application, Evaluation Investm...

Answered by Nasya M. • Economics tutor

5068 Views

The quadratic equation (k+1)x^2 + (5k - 3)x + 3k = 0 has equal roots. Find the possible values of k

We know the discriminant (b^2 - 4ac) must be equal to zero for an equation to have equal roots (think about the fact that the square root of this is taken in the quadratic equation). So we can form the eq...

Answered by Molly I. • Maths tutor

7058 Views

Particles P and Q move in a plane with constant velocities. At time t = 0 the position vectors of P and Q, relative to a fixed point O in the plane, are (16i - 12j) m and -5i + 4j) m respectively. The velocity of P is (i + 2j) m/s and the velocity of Q

is (2i + j) m/s. Find the shortest distance between P and Q in the subsequent motion. This is an m4 question from the edexcel June 2015 paper. First I would explain to the student that I would form an equ...

Answered by • Further Mathematics tutor

2795 Views