8x+4x(x-8)=370
4x^2+24x-370=0
x^2+6x-92.5=0
当b^2-4ac>=0时
为x=[-b±(b^2-4ac)^(1/2)]/2a;
x1={-6+[6*6-4*6(-92.5)]^1/2}/2
=20.7
x2={-6-[6*6-4*6(-92.5)]^1/2}/2
=-26.7
8x+4x(x-8)=370
4x^2+24x-370=0
x^2+6x-92.5=0
当b^2-4ac>=0时
为x=[-b±(b^2-4ac)^(1/2)]/2a;
x1={-6+[6*6-4*6(-92.5)]^1/2}/2
=20.7
x2={-6-[6*6-4*6(-92.5)]^1/2}/2
=-26.7