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a²-b²=(a+b)(a-b)
40=(a+b)(4)
(a+b)=40/4
(a+b)=10
(a+b)^ 2 = a^2 + b^2 + 2ab
a^2 + b^2 = (a+b)^2 - 2ab
= 6^2 - 2.4
= 36 - 8
= 24