Chapter 9 - Solving Quadratic Equations - 9.3 - Solving Quadratic Equations Using Square Roots - Exercises - Page 502: 41

$x=\pm1.2$

$$x^2=1.44$$ $144$ is a perfect square that is a square of $12$. Since there is decimal point, it is reasonable to conclude $1.44$ will be the square of $1.2$. Do not forget the negative square root as well, so the solutions are: $$x=\pm1.2$$