A net force along the x-axis that has x-component fx -120n

Question

Problem: A net force along the x-axis that has x-component Fx = -12.0N + (0.300N/m²)x² is applied to a 3.10kg object that is initially at the origin and moving in the -x-direction with a speed of 7.7m/s.

Part A: What is the speed of the object when it reaches the point x = 7.50m?

Please show work and steps. Do not just copy paste from the internet. Thanks.