Please help me to solve this question.
√189 = √((p-1)^2+20) + √((p-4)^2+80)
Please help, i don't know how to start off......
until you have a polynomial equation.
With your problem:
Square both sides:
Expand the brackets and isolate the square-root:
Now square again, isolate, ....
and finally solve the equation. For confirmation only: You should come out with p = 2