The first 4 terms of a different sequence are: 9, 13, 17, 21. Find an expression for the nth term of the sequence.
To tackle sequence questions like this you first have to find the difference between each term of the sequence and this number will go in front of the 'n'. Then to find the full expression, you have to find out the term that came before the first.
Applying this, the difference is 4 and the term came first would be 5. So the expression for the nth term is 4n+5
TM
Related Maths GCSE answers
All answers ▸How do I solve a simultaneous equation?
The point P has coordinates (3,4). The Point Q has the coordinates (a,b). A line perpendicular to PQ is given by the equation 3x+2y=7. Find an expression for b in terms of a.
You are shown a diagram of a right angled triangle, with the hypotenuse labelled c and the other sides labelled a and b. If a is 7m long and c is 10m long, what is the length of b?
How should I approach my GCSE maths paper?