a =7, b = 5, c = 3 ; a ²+ b ² + c ² - ac - bc

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a =7, b = 5, c = 3 ; a ²+ b ² + c ² - ac - bc - ab=?

A12

B10

Answer:

a = 7 b = 5 c = 3 a ² + b ² + c ² - ac - bc - ab = 7 ² + 5 ² + 3 ² - 7 x 3 - 5 x 3 - 7 x 5 = 49 + 25 + 9 - 21 - 15 - 35 = 83 - 71 = 12

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