Question 148809
Hello Ellen,


{{{x^2+12x-64=0}}}


Move the constant to the right
{{{x^2+12x=64}}}


Multiply it by 4
{{{4x^2+48x=256}}}


Set equal to zero
{{{4x^2+48x-256=0}}}


Factor
{{{(4x-64)(x+4)=0}}}


Set each equal to zero and solve
{{{4x-64=0}}}
{{{4x=64}}}
{{{x=16}}}


{{{x+4=0}}}
{{{x=-4}}}


Solutions: x=16;-4.