Question

(3x-2)² -9(1+x)² = 115

Answer 1

вот ответ)

(3x-2)^2-9(1+x)^2=115

9x^2-12x+4-9(1+2x+x^2)=115

9x^2-12x+4-9-18x-9x^2=1151

-12x+4-9-18x=115

-30x+4-9 = 115

-30-5 =115

-30x = 115+5

-30x=120

x= -4