(x + 6) is a factor in x^2 - mx - 42. What is the value of m? Options: A) 2 B) 2.2 C) 1 D) 4 E) 5
I solved the second degree equation and found it like this:   x^2 - mx - 42 = 0   (x-7)(x+6) = 0   x=7 or x= -6   Substituting both values for x in the equation we find:   x^2 - mx -42   =&gt; (-6)^2 - m(-6) = 42   =&gt; 36+ 6= 
<gadget id="calculator">36+ 6</gadget>
<output>42</output>
42=&gt; 6m = 42-36= 
<gadget id="calculator">42-36</gadget>
<output>6</output>
6=&gt; m = 1   And with 7, using a similar process we end up with:   (7)^2 - m(7) =42   -7m = 42-49= -7   m=-1   Ao,ANS 1
<result>C</result>
(x + 6) is a factor in x^2 - mx - 42. What is the value of m?