Question

найдите f(3-√2)+f(3+√2) если f(x)=х2-7

Answer 1

$f(3- sqrt{2})+f(3+ sqrt{2} )=(3- sqrt{2})^2-7+(3+ sqrt{2})^2-7$ = $9- 6sqrt{2}+2-7+9+ 6sqrt{2}+2-7=8$