Question

решите уравнение (3+x)^2+(5-2x)(5+2x)-3(5-x^2)=1

Answer 1

$(3+x)^2+(5-2x)(5+2x)-3(5-x^2)=1 \\ 9+6x+x^2+25-4x^2-15+3x^2=1 \\ 6x+19=1 \\ 6x=18 \\ x=3$