Question 530867
Not quite, the x-coordinate of the vertex is
{{{ -b/(2a) }}} when the general formula
for the equation is {{{ y = ax^2 + bx + c }}}
So I have:
{{{ -b/(2a) = -1 }}}
{{{ b = 2a }}}
the y coordinate is {{{ -7 }}}, so
{{{ -7 = a*x^2 + 2a*x + c }}}
{{{ a*x^2 + 2a*x + c + 7 = 0 }}}
I can still only get  a formula for the roots in terms
of {{{a}}} and {{{c}}}, so there can be many equations
that have (-1,-7) for a vertex