Solve the quadratic equation 84x2 + 16x = 0 by factoring out the GCF.

• The solutions are x = 0 and x = 4/21
• The solutions are x = -4/21 and x = 0.
• The solutions are x = 0 and x = 4.
• The solutions are x = -4 and x = -4/21

The solution is x = 0 and x = -4/21.