The roots of Ax^2+Bx+1 are the same as the roots of (x - 2)(x + 2). What is A+B?
(x-2)(x+2) =0 expands to
x^2 -4 = 0 divide by -4
-1/4 x^2 + 0x +1 = 0 shows A = -1/4 and B = 0 so A+B = -1/4