Question 729745


{{{x^2+9x+20}}}...write {{{9x}}} as {{{4x+5x}}}

{{{x^2+4x+5x+20}}}....group

{{{(x^2+4x)+(5x+20)}}}

{{{x(x+4)+5(x+4)}}}

{{{(x+4)(x+5)}}}