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How do you find the equation of a circle?

The equation of a circle is given in the form (x-a) 2 + (y-b) 2 = r 2 , in which the centre of the circle is (a,b) and the radius of the circle is 'r'. If you can figure out or are given the co-ordinates of ...
ZK
Answered by Zeeshan K. • Maths tutor
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How do i use the chain rule twice when differentiating?

Ok so for this question we'll use this example: y = (e -2x^2 + 2) 1/5 We start off by making the expression inside the brackets equal to u. In other words u = e -2x^2 + 2. This also means y = u 1/5 Using the...
IL
Answered by Indiya L. • Maths tutor
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Complete the following translation.

Romani Hannibalem timebant. Hannibal vir clarus Africanus erat. quod Romanos non amabat, magnas copias contra Romam ducere et oppidum delere constituit. dux bonus et validus erat. Africani igitur eum magnope...
JH
Answered by James H. • Latin tutor
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Explain how the Norman Invasion was so successful

The Norman Invasion was so successful due, most importantly, to the preceding invasion at York, of Harald Hardrada and Tostig Godwinson. This forced Harold Godwinson to march his army north and leave his Sou...
JH
Answered by James H. • History tutor
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describe in terms of electrons what happens when magnesium oxide is formed from magnesium and oxygen atoms?

Magnesium in a metal, whereas oxygen is a non metal - therefore magnesium oxide is formed by an ionic bond (if it were 2 non metals it would be a covalent bond). It is important to understand that atoms pref...
MK
Answered by Maaedah K. • Chemistry tutor
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