What would be the best method to use in order to solve the following quadratic equation?

4x^2+29x−60=0

a)factoring

b)quadratic formula

c)taking the square root

d)completing the square

Quadratic Formula
a=4
b=29
c=-60

x = -29 +- sq root(841 -4*4*-60) / 2*4
x = -29 +- sq root(841 +960) / 8
x = -29 +- sq root(1,801) / 8
x = [-29 +- 42.4381903478] / 8

x1 = 13.4381903478 / 8
x1 = 1.6797737935

x2 = [-29 - 42.4381903478] / 8
x2 = -71.4381903478 / 8
x2 = -8.9297737935