Please give the solution for this question #3Section 3.5. Guidelines for Sketching a CurveThe following checklist is intended as a guide to sketching a curve y ? f sxd by hand. Not every item is relevant to every function. (For instance, a given curve might not have an asymptote or possess symmetry.) But the guidelines provide all the information you need to make a sketch that displays the most important aspects of the function.A. Domain It's often useful to start by determining the domain D of f , that is, the set of values of x for which f sxd is defined.B. Intercepts The y-intercept is f s0d and this tells us where the curve intersects the y-axis. To find the x-intercepts, we set y ? 0 and solve for x. (You can omit this step if the equation is difficult to solve.)C. Symmetry(i) If f s2xd ? f sxd for all x in D, that is, the equation of the curve is unchanged when x is replaced by 2x, then f is an even function and the curve is symmetric about the y-axis. (See Section 1.1.) This means that our work is cut in half. If we know what the curve looks like for x > 0, then we need only reflect about the y-axis to obtain the complete curve [see Figure 3(a)]. Here are some examples: y ? x2, y ? x4, y ? |x|, and y ? cos x.(ii) If fs2xd ? 2fsxd for all x in D, then f is an odd function and the curve is symmetric about the origin. Again we can obtain the complete curve if we know what it looks like for x > 0. [Rotate 180 about the origin; see Figure 3(b).] Some simple examples of odd functions are y ? x, y ? x3, y ? 1yx, and y ? sin x.(iii) If fsx 1 pd ? fsxd for all x in D, where p is a positive constant, then f is a periodic function and the smallest such number p is called the period. For instance, y ? sin x has period 2? and y ? tan x has period ?. If we know what the graph looks like in an interval of length p, then we can use translation to visualize the entire graphD. Asymptotes(i) Horizontal Asymptotes. Recall from Section 3.4 that if either lim x l ` f sxd ? L or limxl2` fsxd ? L, then the line y ? L is a horizontal asymptote of the curve y ? fsxd. If it turns out that limxl` fsxd ? ` (or 2`), then we do not have an asymptote to the right, but this fact is still useful information for sketching the curve.(ii) Vertical Asymptotes. Recall from Section 1.5 that the line x ? a is a vertical asymptote if at least one of the following statements is true:(For rational functions you can locate the vertical asymptotes by equating the denomi- nator to 0 after canceling any common factors. But for other functions this method does not apply.) Furthermore, in sketching the curve it is useful to know exactlywhich of the statements in (1) is true. If f sad is not defined but a is an endpoint of the domain of f, then you should compute limxla2 fsxd or limxla1 fsxd, whether or not this limit is infinite.(iii) Slant Asymptotes. These are discussed at the end of this section.E. Intervals of Increase or Decrease Use the I/D Test. Compute f 9sxd and find the intervals on which f 9sxd is positive ( f is increasing) and the intervals on which f 9sxd is negative ( f is decreasing).F. Local Maximum or Minimum Values Find the critical numbers of f [the num- bers c where f 9scd ? 0 or f 9scd does not exist]. Then use the First Derivative Test. If f 9 changes from positive to negative at a critical number c, then f scd is a local max-imum. If f 9 changes from negative to positive at c, then f scd is a local minimum. Although it is usually preferable to use the First Derivative Test, you can use the Second Derivative Test if f 9scd ? 0 and f 0scd 0. Then f 0scd . 0 implies thatf scd is a local minimum, whereas f 0scd , 0 implies that f scd is a local maximum.G. Concavity and Points of Inflection Compute f 0sxd and use the Concavity Test. The curve is concave upward where f 0sxd . 0 and concave downward wheref 0sxd , 0. Inflection points occur where the direction of concavity changes.H. Sketch the Curve Using the information in items A- G, draw the graph. Sketch the asymptotes as dashed lines. Plot the intercepts, maximum and minimum points, and inflection points. Then make the curve pass through these points, rising and falling according to E, with concavity according to G, and approaching the asymptotes.If additional accuracy is desired near any point, you can compute the value of the derivative there. The tangent indicates the direction in which the curve proceeds.

Q3. Use the guidelines of section 3.5 to Sketch the curve. y= L x2- 4 30 y = 8x' - 21r' + 18.x + 2 FIGURE 2 period pu -2 -10 (a) Even function: reflectional symmetry FIGURE 4 FIGURE 1 Periodic function: a-p 0 atp a+ 2p translational symmetry (b) Odd function: rotational symmetry y = 8x' - 21.x' + 18x + 2 0 2 6 FIGURE 3 FIGURE 2