Chapter 4 - Quadratic Functions - 4.4 Solving Quadratic Equations by the Square Root Property and Completing the Square - 4.4 Exercises - Page 346: 6

$x=-\frac{\sqrt {1807}}{2},\frac{\sqrt {1807}}{2}$

When taking the square root of a number, you get a positive and a negative answer. $4x^2-43=1764$ $4x^2=1807$ $x^2=\frac{1807}{4}$ $x=-\frac{\sqrt {1807}}{2},\frac{\sqrt {1807}}{2}$