Question

if a+b=12 and ab=27 then find the value of a-b​

Answer 1

Answer:

ab=27

a=27/b

then a+b=12

27/b+b=12

27=12b-b

27=11b

27/11=b

Answer 2

Answer:

6

Explanation:

given : a+b=12 and ab=27.

to find : a-b

solution :

we know that,

( a + b )² = a² + b² + 2ab

=> 144 = a² + b² + 54

=> a² + b² = 90 ———— eq1

now,

(a - b)² = a² + b² - 2ab

=> a - b = √(90 - 54)

=> a - b = √36

=> a - b = 6