Question 697869: I am supposed to solve 3x^2-17x+5 by graphing and I am having trouble finding the zeros can you please help me?
Thanks! Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! I am supposed to solve 3x^2-17x+5 by graphing and I am having trouble finding the zeros can you please help me?
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You don't need the zeroes to graph the parabola.
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vertex occurs at x = -b/(2a) = 17/6
f(17/6) = 3(17/6)^2 - 17(17/6)+ 5 = -19.08
Vertex: (2.8333,-19.08333)
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y-intercept: Let x = 0, then y = 5 giving you point (0,5)
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Plot a few points around x = 2.8 such as x = 1,2,3,4
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Sketch the curve.
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Note: Zeroes can be found using the Quadratic Formula:
x = 5.355 and x = 0.3112..
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Cheers,
Stan H.
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