how to enter mathscript syntax command as per below equation

[azrinchamp]

Signal g(t) is defined as: 𝑔(𝑡)= 3(𝑡+2)𝑢(𝑡+2)− 6(𝑡+1)𝑢(𝑡+1)+ 3(𝑡−1)𝑢(𝑡−1)+ 3𝑢(𝑡−3)
a) Sketch the signal completely. (3 marks)
b) Using MATLAB, plot the signal g(t). (10 marks)
c) Signal g(t) then undergo an operation below:
2g(t + 3)
Plot the new signal 2g(t + 3) using MATLAB.( im trying to do it using mathscript )