Find the value of a if distance between the point (–9cm, a cm) and (3cm, 3 cm) is 13 cm.
Text Solution
Verified by ExpertsThe correct answer is:
B
By using distance formula d = 
⇒ 13 = 
⇒ 13 2 = 12 2 + (3 – a) 2 ⇒ (3 –a) 2 = 13 2 – 12 2 = 5 2
⇒ (3 –a) = ± 5 ⇒ a = 2 cm or 8 cm
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