30.y95(x21)2(x22)(x24)y05 }ddx}[(x21)2(x226x18)]5(x21)2(2x26)1(x226x18)(2)(x21)5(x21)[(x21)(2x26)12(x226x18)]5(x21)(4x2220x122)52(x21)(2x2210x111)Note that the zeros of y0are x51 andx55}1064ˇ1w2w}5}562ˇ3w}<1.63 or 3.37.The zeros of y0can also be found graphically, as shown.[23, 7] by [28, 4](a)Local maximum at x52(b)Local minimum at x54(c)Points of inflection at x51, atx <1.63, and at x <126.96.36.199.yxy= f(x)y= f′(x)y= f′′(x)P0yxy= f(x)y= f′(x)y= f′′(x)P106ˇ1w0w2w2w4w(2w)(w1w1w)w
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