Top answers

What is 'Chain Rule' and why is it useful?

The chain rule is most commonly seen in Leibniz's notation, which is as follows:<o:p></o:p> dz/dx = dz/dy * dy/dx<o:p></o:p> You can remember it intuitively by thinking of the two 'dy...
TK
Answered by Tully K. • Maths tutor
6363 Views

How do I find the maximum/minimum of a function?

The maximum/minimum of a function are the points where the first derivative (the gradient) of the function is zero. So with a function of the form y=f(x), you must take the derivative (dy/dx) and set your re...
EL
Answered by Ellie L. • Maths tutor
43742 Views

What is the difference between a covalent and ionic bond?

Covalent bonds are formed between two non-metals, while ionic bonds are formed between a metal and a non-metal. Both types of bonds involve forming complete outer electron shells. Covalent bond: This bond in...
FL
Answered by Flora L. • Chemistry tutor
61749 Views

PEE or PEEL: which paragraph structure should I use?

PEE stands for Point, Explanation, Example PEEL is the same as above but with an added ' L ' for Link PEE is usually preferable for answering exam essays. In an exam you are fairly limited in how much you ar...
EL
Answered by Emma L. • History tutor
23241 Views

How do I know if a noun is masculine or feminine?

A crash course in noun gender... Spanish is very kind in that it's usually easy to work out whether a noun is masculine or feminine. If it ends in an O it is masculine . If it ends in an A it is feminine . E...
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Answered by Floss T. • Spanish tutor
69196 Views