The product of the roots of x² + 6x - 55 = 0 is: a. -55 b. -6 c. 55

The correct answer is:  [A]:  " -55 " .

Note:

x² + 6x − 55 = 0 ;

-11, 5 ==> -11 + 5 = -6 ; 
-5, 11 ==> -5 + 11 = 6 ; Yes:

So, factor into:   (x − 5) (x + 11) = 0 ; 

The roots:

x = 5; 
x = -11 ; 


The product:  5 * -11 = -55 ; which is:  "Answer choice:  [A]:  " -55 " .