If the distance between the points (2, –2) and (–1, x) is 5, one ofthe values of x is
Question
If the distance between the points (2, –2) and (–1, x) is 5, one of the values of x is
Solution
The distance between two points (x1, y1) and (x2, y2) in a plane is given by the formula:
d = sqrt[(x2 - x1)² + (y2 - y1)²]
Here, we are given that the distance d = 5, x1 = 2, y1 = -2, x2 = -1, and we need to find the value of y2 which is represented as x in the question.
Substituting the given values into the formula, we get:
5 = sqrt[(-1 - 2)² + (x - (-2))²] 5 = sqrt[(-3)² + (x + 2)²] 5 = sqrt[9 + (x + 2)²]
Squaring both sides to get rid of the square root, we get:
25 = 9 + (x + 2)² 16 = (x + 2)²
Taking the square root of both sides, we get:
±4 = x + 2
Solving for x, we get two possible values:
x = 4 - 2 = 2 x = -4 - 2 = -6
So, the possible values for x are 2 and -6.
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