If a(a - 8) = 9 and b(b -8) = 9, where a ≠ b, then a + b =  Choose the most appropriate option.
A) −48
B) −2
C) 8
D) 9
E) 48
i.e. if a = -1 then b = 9   or if a =9 then b = -1   But in each case a+b = -1+9= 
<gadget id="calculator">-1+9</gadget>
<output>8</output>
8   Answer: option 8
<result>C</result>
If a(a - 8) = 9 and b(b -8) = 9, where a ≠ b, then a + b =