Point on the x-axis which is equidistant from (2,−5) and (−2,9) is:
(−7,0)
(14,0)
(−14.0)
(7,0)
A
(−7,0)
B
(14,0)
C
(−14.0)
D
(7,0)
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Solution
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Given points A(2,−5) and B(−2,9) Let the points be P(x,0). So, AP=PB and AP2=PB2 ⇒(x−2)2+(0+5)2=(x+2)2+(0−9)2 ⇒x2+4−4x+25=x2+4+4x+81 ⇒x2+29−4x=x2+85+4x ⇒−4x−4x=85−29 ⇒−8x=56
⇒x=−7 Hence, point on the x-axis which is equidistant from (2,−5) and (−2,9) is (−7,0).
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