Question

if a+b=4 and ab=-2, evaluate a²+b²​

Answer 1

Step-by-step explanation:

given,

a+b=4 and ab=-2

if we do squaring on both sides

(a+b)²=a²+b²+2ab

4²=a²+b²+2×-2 (we know that ab=-2)

16=a²+b²-4

☆a²+b²=20☆

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