Question 434982
{{{4p^2-12p-91=0}}}....use quadratic formula

{{{p = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}......{{{a=4}}}, {{{b=-12}}} and {{{c=-91}}}

{{{p = (-(-12) +- sqrt((-12)^2-4*4*(-91) ))/(2*4) }}}

{{{p = (12 +- sqrt(144-(-1456) ))/8 }}}

{{{p = (12 +- sqrt(144+1456))/8 }}}

{{{p = (12 +- sqrt(1600))/8 }}}

{{{p = (12 +- 40)/8 }}}


{{{p1 = (12 + 40)/8 }}}

{{{p1 = 52/8 }}}

{{{p1 = 6.5 }}}


{{{p2 = (12 - 40)/8 }}}

{{{p2 = 28/8 }}}

{{{p2 = 3.5}}}



{{{ graph( 500, 500, -30, 30, -100, 30, 4x^2-12x-91) }}}