Find the limit

Question

lim
x→−∞

sqrt(4x^6 − x)/(x^3 + 6)

Answer 1

top ---> 2 |x^3|
because sqrt(x^6) is + but sqrt(x^3) is -

bottom ----- x^3 which is -

so 2 |x|^3 /-|x|^3 = -2

Answer 2

Thanx!!