Iwill choose brainliest
pleas answer the 3 questions i have not and hurry

using a graphical tool
determine the roots of the equation
see attached graph
p(x)=x4-9x2-4x+12
1( the answers are
x1=-2
x2=1
x3=3

2) for x=-2
P(-2)=0  is a root

for x=2
P(2)=2(4)-9(2)2-4(2)+12=16-36-8=-28

3) the value of x=-2 is a root of P(x)