Chapter 11 - Section 11.2 - Solving Quadratic Equations by Completing the Square - Exercise Set - Page 779: 80

$x=-1.4, .9$

$3.6x^2+1.8x-4.3=0$ $x=(-b±\sqrt {b^2-4ac})/2a$ $x=(-1.8±\sqrt {1.8^2-4*3.6*(-4.3)})/2*3.6$ $x=(-1.8±\sqrt {3.24+14.4*4.3})/7.2$ $x=(-1.8±\sqrt {3.24+61.92})/7.2$ $x=(-1.8±\sqrt {65.16})/7.2$ $x=(-1.8±8.072)/7.2$ $x=(-1.8+8.072)/7.2$ $x=6.272/7.2$ $x=.871$ $x=(-1.8±8.072)/7.2$ $x=(-1.8-8.072)/7.2$ $x=(-9.872)/7.2$ $x=-1.371$