Question 616310
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
x^4+4x^3-34x^2-76x+105 = (x+7)(x+3)(x-1)(x-5) = 0
roots, (-7,0) (-3.0)(1,0)(5,0) 
Knowing the x-intercepts is an important tool in sketching the graph of the function
{{{drawing(300,300,   -10,10,-200,200,  
 grid(1),
graph( 300, 300, -10,10,-200,200,0,x^4+4x^3-34x^2-76x+105 ))}}}