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solve 2x^2+4x-7=0

Notice that this is a quadratic. First you should try factorisation, then if unsuccessful try completing the square (or the quadratic formula). In this example, factorisation is not possible (I can this furt...
KW
Answered by Katie W. • Maths tutor
8847 Views

What is analysis and how do I show this?

It is likely you have been told to PQA your essay answers- point, quote, analysis. The analysis is very important as it shows why you're using that quote to illustrate that point as well as highlighting any ...
GM
10907 Views

What name is given to the elements on group 7 of the periodic table and what happens to their boiling point as you go down the column?

Halogens. Boiling point increase as you go down the group. (This is because the size of the molecules increase as you go down the group, which increases the strengths of van der Waals forces)
LW
Answered by Leo W. • Chemistry tutor
10378 Views

What is the process by which plants and algae remove carbon from the atmosphere?

Photosynthesis. This question may throw some students off because: 1: They may be used to the question phased as something like 'By what process do plants generate glucose' 2: They may not be aware that alga...
LW
Answered by Leo W. • Biology tutor
4509 Views

What is the difference between an endothermic and exothermic reaction? How would you determine if a reaction was endothermic or exothermic using simple lab equipment?

An exothermic reaction is one in which heat is released from the reaction system to its surroundings, causing an increase in temperature. 'Exo' means to give off, heat is expelled in this reaction. An endoth...
AC
Answered by Annu C. • Chemistry tutor
7793 Views