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# Solve for a watch

1. c=b **square root**a+d
3. (Original post by AlevelMaths42)
what have you done so far?
4. get rid of the root by squaring both sides and start from there

(Original post by AlevelMaths42)
c=b **square root**a+d
5. (Original post by solC)
what have you done so far?
I got a= c^2-b-d
6. (Original post by AlevelMaths42)
I got a= c^2-b-d
what did you do to get to that?
7. That is impossible to solve unless you have the values for b c and d or are meant to give it in terms of b c and d in which case it is just rearranging
8. (Original post by solC)
what did you do to get to that?
square to get rid off the square root so i had c^2=b+a+d
then just subtract them
9. (Original post by AlevelMaths42)
square to get rid off the square root so i had c^2=b+a+d
then just subtract them
If you square both sides remember you need to square the b too, so after you square both sides you should have

so you then need to divide both sides by and subtract d
10. (Original post by solC)
If you square both sides remember you need to square the b too, so after you square both sides you should have

so you then need to divide both sides by and subtract d
Okay thanks but how do i write it? like this?

c^2-d/b^2=a
or
(c^2/b^2)-d=a
11. (Original post by AlevelMaths42)
Okay thanks but how do i write it? like this?

c^2-d/b^2=a
or
(c^2/b^2)-d=a
the second one
12. (Original post by solC)
the second one
okay thanks
13. (Original post by AlevelMaths42)
okay thanks
No worries

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