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What is the value of x if x^2 - 3x +2=0?

This question can be difficult to see where to start, but can be quite easily solved once you realise what you have to do Firstly, let ax 2 + bx + c =0. If this is also true, a=1, b= -3, and c=2. Firstly, fi...
CS
Answered by Charlotte S. • Maths tutor
3560 Views

Differentiate a^x with respect to x

y=a^x take natural logs (also written as ln or log base e) of both sides lny=lna^x by logarithms rules lna^x=xlna lny=xlna Now differentiate implicitly 1/y = (dx/dy)lna Note here lna is just a constant, then...
JM
Answered by James M. • Maths tutor
43056 Views

Make X the subject of the equation (9x-7)/3 = 8y

To start solving a question like this you want to do it in a set of steps: Step 1: Get rid of the division. To do thsi you need to do the opposite function. The opposite of division is multiplication so you ...
RW
Answered by Ruth W. • Maths tutor
5798 Views

Rearrange the following, making c the subject: (3c + b)/2 = c + a

Rearranging is one of the trickier topics in GCSE maths, however as long as you follow it through step by step you shouldn't have a problem. The question asks you to make 'c' the subject. This means you need...
OC
Answered by Olivia C. • Maths tutor
16413 Views

Sam uses 140g of flour to make 12 cakes. How much flour will Sam need to make 21 cakes?

This question can be difficult, because it involve a lot of words. This can make it confusing as to what information we really need to use - just work it through step by step. Sam uses 140g of flour to make ...
OC
Answered by Olivia C. • Maths tutor
12335 Views