If the square of a + the square of B = 25, a + B = 7, find the square of ① A-B; ② AB, ③ a-b
Calculate a = 3, B = 4 or a = 4, B = 3
A-B = - 1 or 1
ab=12
The square of a - the square of B = - 7 or 7
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