zykia1002
23.11.2021 •
Mathematics
The distance between the points P(1,3) and Q(x,7) is 5 units. Find the possible values of x.
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Ответ:
x = - 2 , x = 4
Step-by-step explanation:
Calculate the distance PQ using the distance formula and equate to 5
d =
with (x₁, y₁ ) = P (1, 3) and (x₂, y₂ ) = Q (x, 7 )
PQ = = = , then
= 5 ( square both sides )
(x - 1)² + 16 = 25 ( subtract 16 from both sides )
(x - 1)² = 9 ( take square root of both sides )
x - 1 = ± = ± 3 ( add 1 to both sides )
x = 1 ± 3
Then
x = 1 - 3 = - 2 , or
x = 1 + 3 = 4
Ответ: