Suppose limx→∞ x 2 + 1/ x + 1 − ax − b  = 0. Then a 3 − b 2 is

a=1 and b= minus 1 here it`s an infinity minus infinity form . First do LCM and equate the coefficient of" x square" to zero. And further simplification you get - a-b=0 from this we get a=1 and b= minus 1

Approved