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Question Number 18823 by rish@bh last updated on 30/Jul/17

If P≡(2,1) and A and B lie on x−axis  and y=x respectively such that   PA+PB+AB is minimum find  A and B.

$$\mathrm{If}\:\mathrm{P}\equiv\left(\mathrm{2},\mathrm{1}\right)\:\mathrm{and}\:\mathrm{A}\:\mathrm{and}\:\mathrm{B}\:\mathrm{lie}\:\mathrm{on}\:\mathrm{x}−\mathrm{axis} \\ $$$$\mathrm{and}\:\mathrm{y}=\mathrm{x}\:\mathrm{respectively}\:\mathrm{such}\:\mathrm{that}\: \\ $$$$\mathrm{PA}+\mathrm{PB}+\mathrm{AB}\:\mathrm{is}\:\mathrm{minimum}\:\mathrm{find} \\ $$$$\mathrm{A}\:\mathrm{and}\:\mathrm{B}. \\ $$

Commented by ajfour last updated on 30/Jul/17

just guessing only.

$$\mathrm{just}\:\mathrm{guessing}\:\mathrm{only}. \\ $$

Commented by ajfour last updated on 30/Jul/17

A≡(5−2(√3), 0)   B≡(((7−3(√3))/2),((7−3(√3))/2))

$$\mathrm{A}\equiv\left(\mathrm{5}−\mathrm{2}\sqrt{\mathrm{3}},\:\mathrm{0}\right)\: \\ $$$$\mathrm{B}\equiv\left(\frac{\mathrm{7}−\mathrm{3}\sqrt{\mathrm{3}}}{\mathrm{2}},\frac{\mathrm{7}−\mathrm{3}\sqrt{\mathrm{3}}}{\mathrm{2}}\right) \\ $$

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