if a ( a + 7 ) = 18 and b ( b + 7 ) = 18 , where a ≠ b , then a + b =
"a ( a + 7 ) = 18 = > we have a = 2 or - 9 also b ( b + 7 ) = 18 = > b = 2 or - 9 given a ≠ b 1 ) when a = 2 , b = - 9 and a + b = - 7 1 ) when a = - 9 , b = 2 and a + b = - 7 answer choice c"
add(divide(18, const_10), divide(18, divide(18, const_10)))