Answer:
6a
Explanation:
distance = √(x2-x1)^2 + (y2-y1)^2
distance = √(3a+3a)^2 + (b-b)^2
distance = √(6a)^2 + (0)^2
distance = √36a
distance = 6a
AB = √[(3a - -3a)² + (0)²]
⇒ AB = √[(3a + 3a)² + (0)²]
⇒ AB = √[(6a)² + (0)²]
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