Top answers

How can I solve quadratic equations by completing the square?

When we have a quadratic (ax 2 + bx + c = 0) we can "complete the square" to solve for x. For example x 2 + 8x + 7 = 0. First look at the x 2 + 8x, in particular the coefficient of x, "b"...
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Answered by Thomas B. • Maths tutor
4112 Views

How do I build up and retain a sufficient level of vocabulary?

The need to build up a sufficient level of vocabulary and retain it is extremely important when taking on the written and oral componants of the A level exams both when it comes to to comprehension and expre...
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Answered by Joshua E. • French tutor
2118 Views

How does Synaptic Transmission work?

The brain is made up of structures alled neurons, which acts processed and sends information through electircal impulses. Because neurons do not touch eachother, hese electrical impulses are sent through a g...
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Answered by Zara S. • Psychology tutor
3114 Views

Explain the pull factors of counter-urbanisation.

Counter-urbanisation is the movement from city to rural area (centrifugal movement). Firstly, it is quieter in suburban/rural areas with less traffic, congestion and higher living standards. This is especial...
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Answered by Svenja S. • Geography tutor
12193 Views

What are Descartes' three waves of doubt and his response to it?

Descartes went through three increasingly strong arguments in an attempt to bring doubt to every single thing that he knew. The first is the argument from illusion, in which he suggests that his senses may d...
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Answered by Adam B. • Philosophy tutor
45888 Views