By using 3 steps you can solve the problem:
1) Take "-" sign out and invert the waveform about x-axis, so the equation will become "x(2t-1)",the inverted wave will now have time period "-1" and "-2" instead of "1" and "2" i.e.mirror image about x-axis.
2) Take 2 outside and make time scaling, so the time period of waveform will get deivided by 2, so the equation become
"t-1/2", the time period will get divided by 2.
3) Now shift the complete waveform right for 1/2 period, so the final waveform have the amplitude of 1 and it starts from -1 and ends at 1.