If ab = 12 and a + b = 7 find the value of (a 2 - ab + b 2 )
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a + b = 7
4 + 3 = 7 . 4 * 3 = 12
(4)2 - 12 + (3)2 = 16 + 9 - 12 = 13
4 + 3 = 7 . 4 * 3 = 12
(4)2 - 12 + (3)2 = 16 + 9 - 12 = 13
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Answer:13
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