Question 1128717
{{{5x^2-20x-225=0}}}......first simplify, both sides divide by {{{5}}}

{{{x^2-4x-45=0}}}............factor

{{{x^2+5x-9x-45=0}}}

{{{(x^2+5x)-(9x+45)=0}}}

{{{x(x+5)-9(x+5)=0}}}

{{{(x - 9) (x + 5) = 0}}}

solutions:


{{{(x - 9) = 0}}}=>{{{x=9}}}


{{{(x + 5) = 0}}}=>{{{x=-5}}}


{{{ graph( 600, 600, -55, 55, -55, 55, x^2-4x-45) }}}