ax^2+bx+c=0a(x^2+bx/a)=-ca(x^2+bx/a+b^2/4a^2)=b^2/4a-ca(x+b/2a)^2=(b^2-4ac)/4a(x+b/2a)^2=(b^2-4ac)/4a^2x+b/2a=±√(b^2-4ac)/2ax=[-b±√(b^2-4ac)]/2ax1=[-b+√(b^2-4ac)]/2a,x2=[-b-√(b^2-4ac)]/2ax1+x2=[...