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a) Factorise the following expression (x^2)-49 b) Differentiate the following equation y = (x^2) - 49 and find the stationary points of the equation

a) (x+7)(x-7) b) y = (x^2) - 49 y' = 2x 0 = 2x x = 0 y = (0^2) - 49 y = -49, x = 0
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Answered by Thomas G. • Maths tutor
3752 Views

How do contractions of articles work in French?

Definite articles (le & la) have to be contracted every time they are in front of a word starting with a vowel or a silent h. For example, le + étudiant = l'étudiant, le + homme = l'homme.
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Answered by Anne-Lise M. • French tutor
2627 Views

How can we derive the 'suvat' equations of motion v=u+at and s=(u+v)t/2

v=u+at Using a velocity time graph with constant acceleration, (graph provided as visual aid in tutorial) with initial velocity u and final velocity v, we can see that the graph is a straight line. It theref...
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Answered by Isobel D. • Physics tutor
41517 Views

'Trade is always more effective than aid in reducing global disparities'. Referring to examples, discuss the statement.

Intro- define trade and aid (this is the theory part). assess each side - trade effectivetrade effective as enables less wealthy countries to develop their economies. e.g. Vietnamese catfish; Ghanaian tomato...
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Answered by Emily H. • Geography tutor
4496 Views

Show that (sqrt(3) + sqrt(75))^{2} = 108

The key here is to simplify the left hand side. There are two different approaches to take here, one slightly faster but both perfectly legitimate. First approach: Remember the formula (a + b)^{2} = a^{2} + ...
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Answered by Callum B. • Maths tutor
6826 Views