if x = - 12 / 5 and y = - 6 / 7 , what is the value of the expression - 2 x – y ^ 2 ?
"x = - 12 / 15 and y = - 6 / 7 = = > - 2 ( - 12 / 15 ) - ( - 6 / 7 ) ^ 2 = 24 / 15 - 36 / 49 = 636 / 735 ans : c"
subtract(multiply(7, divide(12, 5)), power(divide(6, 7), 7))