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Solve x^2 – 6x – 8 = 0 Write your answer in the form a ± √ b where a and b are integers. (Higher tier paper)

To solve this equation we cant use the PSF method, as nothing multiplies to -8 and adds to -6. (Also in the question it says the answer will be in a±b which is normally what you get when you can't factorise)...
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Answered by Alex D. • Maths tutor
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Describe how Homer makes Books 9-12 of the Odyssey vivid ?

During these books, Homer creates a flashback sequence narrated by the protagonist Odysseus himself. This is exciting for the reader as finally, we can witness Odysseus creativity firsthand in his storytelli...
ST
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Why was the experiment on DNA done by Meselson and Stahl strong evidence that DNA replication is semi-conservative?

Three theories for DNA replication at the time: Conservative replication: When DNA was replicated, entirely new molecules of DNA were made, meaning a newly replicated DNA molecule would be composed entirely ...
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Answered by Patricia B. • Biology tutor
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How do negative and positive feedback loops occur and how are they different?

Think of them as a flow chart. Stimulus (a change) | Sensor (detects the change) | Control (sends a signal about the change) | Effector (response to the change) (connect a line to Stimulus) Negative feedback...
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Answered by Emma C. • Biology tutor
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How do you prove the formula for the sum of n terms of an arithmetic progression?

An arithematic progression has terms in a sequence such that the difference between any two consecutive terms is a constant and is given by a common difference, say, d. If first term in the progression is a,...
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