if a ( a + 8 ) = 9 and b ( b + 8 ) = 9 , where a ≠ b , then a + b =
"a ( a + 8 ) = 9 = > we have a = 1 or - 9 also b ( b + 8 ) = 9 = > b = 1 or - 9 given a ≠ b 1 ) when a = 1 , b = - 9 and a + b = - 8 1 ) when a = - 9 , b = 1 and a + b = - 8 answer choice a"
add(divide(9, const_10), divide(9, divide(9, const_10)))