Question

x^3 -7x^2 +63-3/(x-3)=9x+3/(3-x)

Answer 1

x³-7x²+63-9x=-3/(3-x)+3/(3-x)
x³-7x²+63-9x=0,x≠3
x²(x-3)-4x(x-3)-21(x-3)=0
(x-3)(x²-4x-21)=0
x²-4x-21=0
x1+x2=4 U x1*x2=-21
x1=-3 U x2=7
Ответ x=-3,x=7