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Often quadratic equations of the form a x 2 + b x+ c =0 can be easily solved by factorising. First, find pairs of numbers that multiply together to make c . Note that if c is positive, the two numbers will h...

Muataions within genes can be caused by several ways. Sometimes they can be spontaneous or other times they can be induced by environmental factors. These factors can include chemicals such as chemicals foun...

f(c) means let x=c. Remember that c is just an unknown number. The expression f(c)=9 means that when we put c through the function f(x)=7-4x, it gives the answer 9. Therefore we know 7-4c=9 is true. Now we h...

A high grade in GCSE Biology requires you jumping through a few hoops. For certain questions, specific facts are required in the answer and certain structures are required for the answers. There isn't too mu...

Structure each paragraph as PEE: point, evidence and explanation. If you follow this structure each paragraph will be clear and easily understandable. Each paragraph can be pretty short if you do this right,...