How many real roots does the equation x^2y+16xy+60y=0 have if y < 0?  Choose one
A) 0  B) 1  C) 2  D) 3  E) Infinite
x^2y+16xy+60y=0   =&gt; y ( x^2 + 16x + 60) = 0   =&gt; y (x+8)^2 = 0   if y&lt;0 , then x=-9   So although there are 2 factors , they are the same x=-9 .   The equations has 3 distinct real root .   Answer 3
<result>D</result>
How many real roots does the equation x^2y+16xy+60y=0 have if y < 0?