Search over 10,000 free study notes

Factorising equations:

Lets look at the example:   Factorise 3x+21 

In order to factorise this equation, we need to find a common factor of both 3x and 21. ...

FIrslty to avoid confusion:

x = the variable x

X = multiplication.

When you differentiate an equation, the derivative (answer) is referred to as...

There is a subtle point to be made here, which comes down to double counting. The addition rule:Pr(A union B) = Pr(A)+Pr(B)-Pr(A intersection B)allows us to work out the probability that either event A or...

              Take a general function f(x) = ax²+bx+c

   First thing to do with every problem is sit back and think a bit: there are usually several ways to solve a problem but one will l...

To work out the number of roots a qudratic ax²​+bx+c=0 you need to compute the discriminant (b²​-4ac).

If the discrimant is less than 0, then the quadratic has no re...