. Find the point on the X axis which is equidistant from A(-3,4) and B(1,-4) .
Solution: Let P(x, ---) be the point on X axis which is equidistant from points A and B.
∴ d(P,A)2
= d(P,B)2
x
2 + 6x + 9 = x2
– 2x +1 ______[ using -------- formula]
----- = -8
x = ------
∴ coordinates of the point on X axis which is equidistant from A and B are P(---, ----).
Answers
Step-by-step explanation:
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Given
Two points A(-3,4) B(1,-4)
To Find
Point which is equidistant from Given Point A and B
Let the required point be P(x,0) which is equidistant from the two given points A(-3,4) and B(1,-4)
let x be a ,we takeP( x,0 )because on x axis y is zero
•A(-3,4)___________•P(a,0)___________•B(1,-4)
we will use distance formula for finding distance between any two points
If P is equidistant from point A and B then AP=PB
AP=√(a+3)²+(0-4)²
AP=√a²+9+6a+16
AP=√a²+6a+25
PB=√(1-a)²+(-4-0)²
PB=√1+a²-2a+16
PB=√a²-2a+17
Now AP=PB
√a²+6a+25=√a²-2a+17
squaring both sides
=>a²+6a+25=a²-2a+17
a² gets cancelled as lie on both side [base same]
=>6a+2a+25-17=0
=>8a+8=0
=>8a=-8
a=-8/8=-1
a=-1
∴P(-1,0) is the point on x axis which is equidistant from A(-3,4) and B(1,-4)