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Solve the following system of simultaneous equations: y=x^2 - 5x + 4 ; x+2y=19

Sub y=x^2 - 5x + 4 into x+2y=19x+2(x^2 -5x + 4) = 19x + 2x^2 -10x + 8 =192x^2 - 9x -11 = 0 (2x -11)(x+1) = 0x= 5.5x=-1
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Answered by Sulamaan R. • Maths tutor
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differentiate with respect to x. i). x^(1/2) ln (3x),

From this we can see that equation has 2 parts therefore we should look to using the product rule which is used to differiantiate a two functions multiplied together so (fg)'=f'g+fg'. In this question the di...
JD
Answered by Jesse D. • Maths tutor
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Describe how haemoglobin binds to oxygen:

The binding curve of haemoglobin to its substrate is sigmoidal ('s' -shaped). Haemoglobin has four subunits, each of which will bind one molecule of oxygen. The reason for the sigmoidal shape is the process ...
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Answered by Emma B. • Biology tutor
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Explain how red blood cells are adapted to carry oxygen.

Firstly, red blood cells contain the globular protein haemoglobin which is able to bind reversibly with oxygen. This means red blood cells can take up and then release oxygen as they transport it around the ...
LC
Answered by Laura C. • Biology tutor
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Why are there two types of future tense used in French and when should each be used?

Similar to the English language, French has two main ways of expressing an event which is going to happen in the future.The first is the standard future tense which can be used to discuss events that will ha...
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Answered by Laura C. • French tutor
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