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# Maths gcse q watch

1. Hi got my exam in a couple of hours can any one explain quickly this question?

x = 2^k and rt(4/x) = 2^c

and the answer is c = 1 - (k/2)

Pleas help,
thanks
2. (Original post by andy_)
Hi got my exam in a couple of hours can any one explain quickly this question?

x = 2^k and rt(4/x) = 2^c

and the answer is c = 1 - (k/2)

Pleas help,
thanks
do you mean rt() to mean square root of?

basically 4/x = 2^2/2^k = 2^(2-k)
square root of y = y ^ 1/2

so sqrt (4/x) = 2^1/2(2-k) = 2^(1-k/2) = 2^c

so c = 1-k/2
3. (Original post by 4Ed)
do you mean rt() to mean square root of?

basically 4/x = 2^2/2^k = 2^(2-k)
square root of y = y ^ 1/2

so sqrt (4/x) = 2^1/2(2-k) = 2^(1-k/2) = 2^c

so c = 1-k/2
ahhhh coool thanks a lot for that. I get it now.

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