Question 102747

The x-intercepts are where the graph crosses the x-axis, and the y-intercepts are where the graph crosses the y-axis. 

{{{y = x^2 +4x}}}
Find x for what y = o
{{{x^2 + 4x =0}}}
{{{x(x + 4) = 0}}} this product is equal to 0 if {{{x }}}or {{{(x+4)}}} is equal to 0 

Solutions:
{{{x1 = 0}}}
{{{x2 = -4}}}

Here is the graph:



*[invoke quadratic "x", 1, 4, 0]