exam Maths Puzzle Numerical Ability

The questions state:

Find all values of y such that the distance between (3,y) and (-2,9) is 12.

I am stumped and need help PLEASE!

thanks!

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exam Other Question
Okay, I guess I did not get it. the little 3 outside the square root of 8y^3

please explain. i also need #16 answered also same chapter, and we are working on rational expressions