Question

If a + b = -9 and ab = 5 then the value of a 2 + b 2 =

Answer 1

Step-by-step explanation:

(a+b)² = a² + b² +2ab

(-9)² = a²+b²+2×5

81 = a²+b²+ 10

a² + b² = 81-10 =71