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Using the distance formula, what is the distance between [tex]\( C(-4, -2) \)[/tex] and [tex]\( D(3, 5) \)[/tex]?

A. 15
B. 45
C. 9.8
D. 22

Sagot :

To determine the distance between the points [tex]\(C(-4, -2)\)[/tex] and [tex]\(D(3, 5)\)[/tex], we can use the distance formula. The distance formula for two points [tex]\((x_1, y_1)\)[/tex] and [tex]\((x_2, y_2)\)[/tex] is:

[tex]\[ \text{Distance} = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} \][/tex]

First, identify the coordinates of the points:
- [tex]\(C(x_1, y_1) = (-4, -2)\)[/tex]
- [tex]\(D(x_2, y_2) = (3, 5)\)[/tex]

Next, calculate the differences in the x and y coordinates:
- [tex]\(\Delta x = x_2 - x_1 = 3 - (-4) = 3 + 4 = 7\)[/tex]
- [tex]\(\Delta y = y_2 - y_1 = 5 - (-2) = 5 + 2 = 7\)[/tex]

Now, apply these differences to the distance formula:
[tex]\[ \text{Distance} = \sqrt{(\Delta x)^2 + (\Delta y)^2} = \sqrt{(7)^2 + (7)^2} = \sqrt{49 + 49} = \sqrt{98} \][/tex]

Taking the square root of 98, we get approximately:
[tex]\[ \sqrt{98} \approx 9.899494936611665 \][/tex]

So, the distance between the points [tex]\(C(-4, -2)\)[/tex] and [tex]\(D(3, 5)\)[/tex] is approximately [tex]\(9.899494936611665\)[/tex]. Given the options, [tex]\(9.8\)[/tex] is the closest to this value.

Thus, the distance is approximately:
[tex]\[ \boxed{9.8} \][/tex]