Question 153940
{{{f(x)=6x+x(x-1)}}}
{{{f(x)=6x+x^2-x}}}
{{{f(x)=x^2+5x}}}
{{{f(x)=x(x+5)}}}
x-intercepts occur when f(x)=0.
First solution
{{{x=0}}}
Second solution 
{{{x+5=0}}}
{{{x=-5}}}
The x intercepts are x=0 and x=5.
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Here is a graphical check of the answer.
{{{ graph( 300, 300, -6, 6, -6, 6, 6x+x*(x-1)) }}}