How many real roots does the equation x^3y+16xy+64y=0 have if y < 0?
Choose the correct choice from the following choices.
A) 0 B) 1 C) 2 D) 3 E) Infinite
x^3y+16xy+64y=0   =&gt; y ( x^2 + 16x + 64) = 0   =&gt; y (x+8)^2 = 0   if y&lt;0 , then x=-8   So although there are 2 factors , they are the same x=-8 .   The equations has 1 distinct real root .   Answer 1
<result>B</result>
How many real roots does the equation x^3y+16xy+64y=0 have if y < 0?