Question

a+b=9 and ab=-22 then (a) 2-(b) 2=?

Answer 1

(a plus b)^2 - (a - b) ^2 -- 4ab then, 81 - ( a-b)^2 -- (-88) then , (a-b)^2 -- 81 plus 88 -- (169) therefore, (a-b)^2 -- (169) & (a-b) -- 13 so, a^2-b^2--- (a-b) (a plus b) --- 9x13 -- 117