Question

sa se rezolve in R ecuatia 4 supra x-3 =x-3 supra 25

Answer 1

$\it \dfrac{4}{x-3}=\dfrac{x-3}{25} \Rightarrow (x-3)^2=100 \Rightarrow \sqrt{(x-3)^2}=\sqrt{100} \Rightarrow \\ \\ \\ \Rightarrow |x-3|=10 \Rightarrow x-3=\pm10 \Rightarrow x-3\in\{-10,\ 10\}\bigg|_{+3} \Rightarrow x\in\{-7,\ \ 13\}$