In a bracketing method, how does the lower limit [math: xl] get updated?单项选择题

题目图片
A

a. [math: xl] is set equal to [math: xr] if [math: f(xl)∗f(xr)>0]

B

b. [math: xl] is set equal to [math: xr] if [math: xl∗xr>0]

C

c. [math: xl] is set equal to [math: xr] if [math: f(xl)∗f(xr)<0]

D

d. [math: xl] is set equal to [math: xr] if [math: xl∗xr<0]

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