Question 1118696
Two of the given points are the zeros.


{{{y=a(x+1)(x-5)}}}


The other, non-root point, will establish the leading coefficient.

{{{a=y/((x+1)(x-5))}}}

{{{a=21/((-2+1)(-2-5))}}}

{{{a=21/(-1(-7))}}}

{{{a=21/7}}}

{{{a=3}}}

-

{{{system(y=3(x+1)(x-5),or,y=3(x-(-1))(x-5))}}}