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4^2 - 4
16 - 4
12
(b x a) - d
5 x 4 - 2
20 - 2
18
4² - 4 = (4 x 4) - 4 = 16 - 4 = 12
B × A - D = (B × A) - D
(5 × 4) - 2 = 20 - 2 = 18