completing the square

1.4/2=0.7

0.7 squared =0.49

$$\\x^2+1.4x+0.49=1.2+0.49\\ x^2+1.4x+0.49=1.69\\ (x+0.7)^2=1.3^2\\ x+0.7=\pm 1.3\\ x=0.6 \;\;or\;\;x=-2$$