Question

find the answer of question​

Answer 1

Answer:

(a + b) = 7

On squaring both sides;

(a + b)² = 7²

a² + b² + 2ab = 49

a² + b² + 2 * 12 = 49

a² + b² + 24 = 49

a² + b² = 49 - 24

a² + b² = 25

Now,

a² - ab + b²

⇒ a² + b² - ab

⇒ 25 - 12

⇒ 13

Hence, the answer is 13.