t(t+3)+t^2-9=0 решите пж:(

t(t+3)+t^2-9=0t^2+3t+t^2-9=02t^2+3t-9=0D=b^2-4ac=3^2-4*2*(-9)=9+72=81=9^2x1=(-b-√D)/2a=-3; x2=(-b+√D)/2a=3/2