I really need help with this one please and thank you and can yall explain this to me. I am in math class

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

In each of the cases that follow, the magnitude of a vector is given along with the counterclockwise angle it makes with the +x axis. use trigonometry to find the x and y components of the vector. also, sketch each vector approximately to scale to see if your calculated answers seem reasonable. (a) 50.0 n at 60.0°, (b) 75 m/ s at 5π/ 6 rad, (c) 254 lb at 325°, (d) 69 km at 1.1π rad.

The anwser cause i do not understand just plez