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Solve the simultaneous equations: x^2 + y^2 = 25 and y − 2x = 5

x 2 +y 2 =25, y-2x= 5 y = 5+2x -----> y 2 = (5+2x) 2 = 25 + 20x +4x 2 x 2 + 4x 2 + 20x + 25 = 25 5x 2 + 20 x = 0 x = 0 y = 5+(2*0) y=5
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Answered by Alex G. • Maths tutor
26813 Views

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
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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
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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
40689 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
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