29)
If the distance between the point A(4,P) and B(0,1) is
5,then
A.4
B.-4
C.+ - 4
D.O
Answers
Answered by
0
Answer:
A. 4
Step-by-step explanation:
AB = ROOT [ (0-4)^2 + (1-P)^2 ]
5 = ROOT [ 16 + 1 - 2P + P^2 ]
25 = 17 - 2P + P^2
P^2 - 2P - 8 = 0
P^2 - 4P + 2P - 8 = 0
P(P - 4) + 2(P - 4) = 0
(P - 4)(P + 2) = 0
P = 4 or P = -2
According to the options:
Answer is A. 4
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