Question

If (a - b) = 4 and ab = 2, then (a² + b²) = ?​

Answer 1

Answer:

20

Step-by-step explanation:

(a-b)^(2)=a^2-2ab+b^2

(4)^(2)=a^2+b^2-2×2

16=a^2+b^2-4

16+4=a^2+b^2

20=a^2+b^2

a^2+b^2=20

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