Question

Помогите :(((
(5-x)^2=3x(5-x)

Answer 1

$(5-x)^2=3x(5-x) \ \ 25-10x+x^2=15x-3x^2 \ \ 4x^2-25x+25=0 \ \ D=b^2-4ac=25^2-4*4*25=225>0 \ \ x_1= frac{-b- sqrt{D} }{2a}= frac{25- sqrt{225} }{2*4}=1,25 \ \ x_2 =frac{-b+ sqrt{D} }{2a}= frac{25+sqrt{225} }{2*4}=5$