Question 109919
THIS IS THE FACTORING METHOD
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3X^2+11X-20=0
(3X-4)(X+5)=0
3X-4=0
3X=4
X=4/3 ANSWER.
X+5=0
X=-5 ANSWER.
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THIS IS THE QUADRATIC EQUATION METHOD.
x^2+3x-4=0
x = (-b +- sqrt( b^2-4*a*c ))/(2*a)
x=(-3+-sqrt[3^2-4*1*-4])/2*1
x=(-3+-sqrt[9+16])/2
x=(-3+-sqrt25)/2
x=(-3+-5)/2
x=(-3+5)/2
x=2/2
x=1 answer.
x=(-3-5)/2
x=-8/2
x=-4 answer.
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3X^2-X-1=0
Y=3X^2-X-1 FOR THE GRAPHING METHOD:
{{{ graph( 300, 200, -6, 5, -10, 10, y = 3x^2 -x -1) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 3x^2 -x -1).
(.767,0)(-.43,0)(.1685,-1)  
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Teacher comments when I submitted this answer 
1.The graphing method is incomplete.
2.The third equation is graphed, but the solutions are not identified. Where are they located? I need help with this