Question

(2x+4)^2=11x^2+1        xDDD

Answer 1

4x² + 16x + 16 = 11x² + 1
-7x² + 16x + 15 = 0
7x² - 16x - 15 = 0
D = 256 + 420 = 676 = 26²
$x_{1}$= $frac{16+26}{14}$ = 3
$x_{2}$= $-frac{16-26}{14}$ = $-frac{5}{7}$