Please show all workings: Q1) The line y=x-6 and the parabola y^2=8x intersect at A and B. Find the length of ABAns: 16root2
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2011-03-06 3:18 am
回答 (2)
2011-03-06 3:26 am
✔ 最佳答案
Q1) The line y=x-6 and the parabola y^2=8xintersect at A and B. Find the lengthof AB
Sol
y^2=8x
(x－6)^2=8x
x^2－12x+36=8x
x^2－20x+36=0
(x－18)(x－2)=0
x=18 or x=2
(1) x=18
y=18－6=12
(2) x=2
y=2－6=－4
So
AB^2=(18－2)^2+(12+4)=512
AB=16√2
2011-03-06 10:07 pm
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Try this...
http://hk.knowledge.yahoo.com/question/question?qid=7011030500740
Although it has an answer already, but i don't understand, can u help me to answer it? Okay?? be quick wo....
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