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The coordinates of A are (6, -2) I have managed to do every other question in this section but this one, my brother tried to help but just drew a graph and the answers without explaining it, i dont understand the technique behind it? thanks for your help

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    square root around (y1-y2)squared + (x1-x2)squared..? then yes but you end up with a k squared minus a k2012-09-18

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Hint: By the Distance Formula, or equivalently by the Pythagorean Theorem, $\sqrt{(2-6)^2+(k-(-2))^2}=5.$ Square both sides and simplify. You will get a quadratic equation in $k$. Solve. To solve, you can use the Quadratic Formula, or note that the resulting quadratic factors nicely.

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    omg thankyou! i see what to do now! x2012-09-18