Question

a=13,b=5,a.b=60 then [a.b]=?​

Answer 1

this questions answered is 60

Answer 2

Answer:

25

Explanation:

|a.b| = 25

Step-by-step explanation:

Given that

|a| = 13, |b| = 5, a.b = 60

We know that

|a ×b|² = |a|²|b|² - (a.b)²

⇒ (13)² (5)² - (60)²

⇒ (169)(25) - 3600

⇒ 4225 - 3600 = 625

[∵ (25)² = 625]

⇒ |a.b| = 25

Hope it helps you...