Question

(3x+2)^2-9x^2=0 решить уравнение

Answer 1

$(3x+2)^2-9x^2=0 \ -9x^2+(3x+2)^2=0 \ -9x^2+(3x)^2+2 cdot 3x cdot 2+2^2=0 \ 4-9x^2+3^2x^2+12x=0 \ 9x^2-9x^2+12x+4=0 \ 12x+4=0 \ 12x=0-4 \ 12x=-4 \ boxed{x= frac{-4}{12} =boxed{- frac{1}{3}}}$