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Maths
GCSE

The area of a rectangle is 8cm^2. The rectangle is (3x+1) by (2x+5). Find the value of x

Area of a rectangle is width times height (3x+1)(2x+5)= 6x2+15x+2x+5            6x2+17x+5 Set formula of area equal to known area value. 6x2+17x+5= 8 6x2+17x-3 ...

CD
Answered by Conrad D. Maths tutor
5963 Views

Find the inverse of the following function: g(x) = 4/(3-x)

A function is simply a process that takes in a number, does a few operations on it (for example, add, multiply etc), and then gives out another number. If you want to figure out the inverse of a function,...

EM
Answered by Eytan M. Maths tutor
4862 Views

How do you complete the square?

Say you start with a general equation of x2+ax+b=0. (If the x2 has a coefficient the you will need to divide by that first.)

You need to move to the equation (x+a/2)2

BC
Answered by Bryony C. Maths tutor
2863 Views

How do you factorise?

Factorising is just simplyfying into brackets. To do this you need to find common terms on all the parts of the question. For example: fully factorise 3a3b+12a2b2+...

EW
Answered by Elizabeth W. Maths tutor
6778 Views

How do you factorise a quadratic with a co-efficient in front of the x^2 - e.g: 3x^2 + 14x + 8

Ok so to factorise a quadratic with a co-efficient in front of the x^2 you need to follow a couple of steps: Step 1 - multiple the co-efficient by the number at the end of the expression - e.g. 3^8 = 24 S...

NK
Answered by Nathaniel K. Maths tutor
3464 Views

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