Answer: sqrt(2/7) 


Explanation:
7x^2=2
x^2=2/7    (divided both sides by 7)
x=sqrt(2/7)    (squarerooted both sides to get x)

Ans: square root 2/7

Explanation:
7x^2=2
1.divide both sides by 7 x^2=2/7
2.square root both sides. x=Square root 2/7

GCSE

Maths

7x^2 = 2   X needs to be the subject?

To find the nth term you need to find the constant difference
This is the term to term rule 
In this case 21-25=-4, 17-21=-4, etc
So our constant difference is -4. This becomes the coefficient (number next to) n in the nth term
The next step is to find out what we need to add to this to reach our first term 
As the nth term in linear sequences is an+c, we know a=-4
Substitute n=1 so we have -4 * 1 +c= 25
We rearrange to find c=29
This gives us an nth term of -4n+29 and this can be checked against your other values
Hope this was helpful!

Ans: -4n+29

Explanation:
The difference down the sequence is -4. Then the position number times the difference is worked out. Eg 25 is position 1 so 1x-4=-4. 21 is position 2 so 2x-4=-8 and so on for the rest of the sequence. Then work out the difference from the new number to the original number. Eg. -4 to 25=29. -8 to 21=29 -12 to 17=29

So the answer is -4n+29

A-Level

Nth term of 25 21 17 13 9 5?

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