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Question

a. Find the vertex and intercepts.
b. Sketch the graph.
c. Confirm your sketch using PLOT CONIC from the accompanying disk, or another suitable graphing program.
Find the vertex and intercepts of the following parabolas, and sketch the graph. Find decimal approximations for any radicals you encounter.
y=15x2+2x115y=\frac{1}{5} x^2+2 x-\frac{11}{5}

Solutions

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(a) In general, a parabola is given by the equation

y=ax2+bx+cy = ax^2+bx+c

The vertex of this parabola is the point (x0,y0)(x_0,y_0) given by

x0=b2a,y0=4acb24ax_0 = -\frac{b}{2a},\,\,\, y_0 = \frac{4ac-b^2}{4a}

The xx-intercepts x1x_1 and x1x_1 (if they exist) are given by the formula

x1,2=b±b24ac2ax_{1,2} = \frac{-b\pm \sqrt{b^2-4ac}}{2a}

The yy-intercept is given by y1=cy_1=c.

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