Week 14 prec 11

We finished the ch8 in the week 14.

For the absolute value equations, the key thing is the x-intercepts, we should find the x-intercepts first when we doing these questions, after we find the x-intercepts, we turn the negative part over the x-axis. 

For the reciprocals functions, we should remember the shape of the two functions, and the asymptotes of the reciprocals functions the the x-intercepts of the original functions, for the special one, quadratic function, we have three shapes. Because the quadratic functions can have no x-intercept. 

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