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How do I factorise quadratic equations?

Take the example x 2 + 5x + 6.You need to think of 2 numbers that multiple together to make 6, and add together to make 5. Therefore in the brackets we need 2 and 3. As all the signs are positive in this exa...
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Answered by Adam S. • Maths tutor
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How to solve the simultaneous equations 3x+2y=7 and 5x+y=14

Firstly we rearrange one of these equations so that we have y on one side of the equation on its own. Let's do this with the second equation. So from 5x+y=14, we can minus 5x from both sides to get: y=14-5x ...
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Answered by Imogen B. • Maths tutor
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Explain how a vaccination prevents infection [3 marks]

The main way in which vaccinations prevent infection is by causing white blood cells to produce antibodies . These antibodies are produced rapidly upon re-infection and kill the pathogens.
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Answered by Odette F. • Biology tutor
12719 Views

What is diffusion? (GSCE: OCR, Edexcel, AQA)

Definition : diffusion is the spreading out of particles from an area of high concentration to an area of low concentration The theory: Diffusion, is the scientific description for the gradual movement of pa...
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Answered by Ned F. • Biology tutor
14804 Views

How would you solve a quadratic equation by factorising?

Solve the equation : x 2 - 8x + 15 The first step is to factorise the quadratic equation. 1. You must find two numbers which will add to give -8 and multiply to give 15. The numbers that would do this are -5...
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Answered by Angelin G. • Maths tutor
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