Question

if (a-b)=7 and ab=9 then (A2 + b2 )=?​

Answer 1

Answer:

67

Step-by-step explanation:

a2+b2=(a--b)2+2ab=7×7+2.9=67

Answer 2

Answer:

a² + b² = 67

Step-by-step explanation:

Given that a - b = 7' and a.b = 9 and we need to find a² + b².

We will be using one of the algebraic identities as mentioned:

(a-b)² = a² -2ab + b²

[a -b], [ab = 9]

=> (7)² = a² - 2 × 9 + b²

=> 49 + 18 = a² + b²

=> 67 = a² + b²