Before we learn on drawing... let me help you on the important steps involved in it
- First we have to plot the intercepts The four points are (a,0), (-a,0) and (0,b), (0,-b)
- Using this four points draw the rectangle
- Draw two lines forming diagonals of the rectangle .It represents the asymptotes of the hyperbola
- Now draw the hyperbola that with the vertices's (a,0) and (-a,0)
Two variables x and y are connected by an equation of the form y = ax2 + bx + c then it is called a quadratic polynomial. We have already seen in Algebra that the equation ax2 + bx + c = 0 is a quadratic equation. This is the reason why we call y = ax2 + bx + c as a quadratic graph. For each value of x the equation y = ax2 + b x + c gives a value of y and we obtain an ordered pair (x, y) of real numbers. The set of all such ordered pairs define the graph of y = ax2 + bx + c called the quadratic graph.
The following procedure is used in drawing quadratic graphs:
By substituting selected values for x in the equation y = ax2 + bx + c, we get corresponding values for y and then we form a table.
Draw x-axis and y-axis on the graph sheet and choose a suitable scale on the co-ordinates axes. The scale for both the axes are chosen depending on the values of the co-ordinates obtained.
Plot the points in the Cartesian plane of the graph sheet.
Join these points by a smooth curve, then we get the required quadratic graph of y = a x2 + bx + c
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