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How do you find the original price of a sale item when a percentage decrease has been applied?

Let's use an example, for instance, a pair a trainers in the sale are advertised as having 25% off, and are now a price of £24. How would you find the original price of the trainers before the sale?Firstly, ...
EG
3640 Views

For what values of x is 2x^2 - 11x - 6 > 0 ?

The first step is to factorise the equation into two brackets. In this case we get (2x+1)(x-6)Now, for this to be greater than zero we need both brackets to be greater than zero, or both brackets to be less ...
RK
Answered by Rowan K. • Maths tutor
4040 Views

Find x in the following equation: 4x + 8 -2x = 10

First combine the x-parts of the equation: 4x - 2x = 2x Next move the "number parts" so they are all on the same side: 2x + 8 = 10 ---> 2x = 2 Then divide through by 2 to move the 2 from the 2x ...
EM
Answered by Elizabeth M. • Maths tutor
5133 Views

Why is completing the square useful and how do you do it?

Completing the square is nice and easy. If you have an equasion of the form x 2 +ax+b=0 then simply rewrite the equasion in the form (x+a/2) 2 -(a/2) 2 +b=0. This may sound complicated but is we use numbers ...
EB
Answered by Edward B. • Maths tutor
4005 Views

Expand and simplify 3(x+4) - 2(4x+1)

3(x+4) - 2(4x+1)= 3x + 12 - 8x + 2= 3x - 8x + 12 - 2= -5x + 10
PP
Answered by Pioli P. • Maths tutor
6083 Views