If the distance between the points (4, p) and (1, 0) is 5, then the value of p…
2019
If the distance between the points (4, p) and (1, 0) is 5, then the value of p is:
- A.
4
- B.
0
- C.
±4
- D.
−4
Attempted by 118 students.
Show answer & explanation
Correct answer: C
Solution:
Use the distance formula between (4, p) and (1, 0):
sqrt((4 - 1)^2 + (p - 0)^2) = 5
Square both sides to remove the square root:
(4 - 1)^2 + p^2 = 25
9 + p^2 = 25
p^2 = 16
p = ±4
Therefore the values of p are 4 and -4.
Quick check:
For p = 4: distance = sqrt(9 + 16) = 5.
For p = -4: distance = sqrt(9 + 16) = 5.
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