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(a) Expand and simplify (x − 3)(x + 5), ..2 marks.. (b) Solve x^2 + 8x − 9 = 0 ..3 marks..

(a) Remember: Multiply each term in the left bracket by every term in the right bracket.(x-3)(x+5) = x 2 + 5x - 3x -15.Collecting all of the like terms:= x 2 + 2x -15. (b) Solve x 2 + 8x − 9 = 0Remember to p...
JW
Answered by Jack W. • Maths tutor
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What is the difference between simple diffusion and active transport?

Simple diffusion is the movement of a molecules from an area of high concentration to an area of low concentration across a semipermeable membrane. Diffusion happens in liquids and gases as their particles m...
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Answered by Simi K. • Biology tutor
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Solve the equation 2(Sinhx)^2 -5Coshx=5, giving your answer in terms of natural logarithm in simplest form

It doesn't hurt to write down the equation again, so let's do so. Equation: 2(Sinh x ) 2 - 5Cosh x = 5 . Hmm, we don't really like to do maths with two different trig functions, why don't we see if we can re...
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I don't understand how I am supposed to structure my responses to the longest questions in the exam, can you help?

Long form answers can be difficult to get to grips with so don't worry about finding them intimidating, but hopefully I can give you a few tips that makes them seem a little less daunting. Firstly, I am goin...
Answered by • History tutor
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How are red blood cells well adapted to their function?

Firstly red blood cells have very few organelles, losing many of them such as the nucleus in order to maximise the amount of haemoglobin they can hold. Furthermore they are relitavely thin meaning they have ...
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Answered by Anish t. • Biology tutor
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