- A-4
- B8
- C-6
- D-8
Step-by-Step Solution
→ → → = ±6, so or . The question asks for the negative value, so (8 is the rejected root). Writing forgets to undo the −2; writing subtracts the 2 instead of adding it.
Answer: A) -4
The point A(k, −5) is 10 units away from B(2, 3). Find the NEGATIVE value of k.
Class 10Coordinate GeometryGeometry — Coordinates
Key idea: Distance formula
**Distance** between two points P₁, ₁) and Q₂, ₂):
**PQ = **
This is just the Pythagoras theorem applied to the right triangle formed with horizontal and vertical legs.
**Example**: Distance between (3, 4) and (7, 1).
= .
**Special distance from origin**: distance of from (0, 0) is .
**PQ = **
This is just the Pythagoras theorem applied to the right triangle formed with horizontal and vertical legs.
**Example**: Distance between (3, 4) and (7, 1).
= .
**Special distance from origin**: distance of from (0, 0) is .
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