Question

find the value of the following :
a^2 + b^2 when a - b = 4 and ab = 3​

Answer 1

Answer:

a-b=4

ab=3

(a-b)² = (a²-2ab+b²)

4² = (a²-2ab+b²)

16 = (a²-6+b²)

16+6 = (a²+b²)

22 = (a²+b²)