Question

Ifa? - b2 = 36 and a-b = 12 then average of
a' and 'b' is?
B. 12
C. 6
D. 3/2
A. 3​

Answer 1

Answer:

D. 3/2

Step-by-step explanation:

Given : a² - b² = 36

a - b = 12

Identity : x² - y² = (x + y)(x - y)

(a + b)(a - b) = 36

(a + b)(12) = 36

a + b = 3

Average of a and b →

= (a + b)/2

= (3)/2

= 3/2

Hence, Option D. is correct.