Question 1132259

{{{ 5x^2+40x+80=0 }}}...simplify, both sides divide by {{{5}}}

{{{ x^2+8x+16=0 }}}.......factor

{{{ x^2+4x+4x+16=0 }}}

{{{ (x^2+4x)+(4x+16)=0 }}}

{{{ x(x+4)+4(x+4)=0 }}}

{{{ (x+4)(x+4)=0 }}}

solution: {{{x=-4}}} multiplicity 2 or a double root