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Topic review (newest first)
a circle with centre at (a,b) and radius r the value of which you will know.
If you choose a point outside the circle you will have a value for x and y that cannot work in the equation. So think about the largest x valuie that will give a possible y.
bobbym: I'm getting a larger value than yours.
LATER EDIT: Whilst sitting in the dentist's chair I re-worked this and realised my error. I forgot to divide by 2 when completing the square. I now get the same answer. My apologises.
Good news: teeth all OK.
cooljackiec: I have added a new post to an old question of yours at
http://www.mathisfunforum.com/viewtopic … 35#p279935
Find the largest real number x for which there exists a real number y such that x^2 + y^2 = 2x + 2y.
17/4 is what I got too.
x by 4
shortcut note: using the usual quadratic notation the midpoint is at -b/2a
oh thanks. so it is the chord with (2,0) and (0,8) and the tangent. the radius is 17/4.
post 7 Q1
aggh... i thought 25 + a = 36 and a was 9. the last coordinate is 11/5.
No. You had 33/5 correct before. It's the x coord that was wrong.
is the x coordinate for the reflection problem 9/5??
Are you thinking it must go through (0,0) ?
for the square, how can a line with slope 6 bisect the square?
It looks like you did the correct working and then wrote down the wrong answer.
(7/5, 33/5) i believe.