Question 22
If $(x^2+1)(y^2+1)+9=6(x+y)$, find $x^2+y^2$.
Interpretation: Take x and y to be real numbers, as required by the source sum-of-squares argument.
Answer format: enter the integer answer without units. Leading zeros are optional; the original paper uses four-digit boxes.
Interpretation: Take x and y to be real numbers, as required by the source sum-of-squares argument.
Answer format: enter the integer answer without units. Leading zeros are optional; the original paper uses four-digit boxes.