If a + b = 4 and a2 + b2 = 10, what is the value of ab?
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Answer:
ab = 3
Step-by-step explanation:
(a+b)2 = a2 + b2 + 2ab
(4)2 = 10 + 2ab
16 = 10+ 2ab
2ab = 16 - 10
ab = 6/2
ab =3
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