Question

помогите решить второй

Answer 1

(x + 4)² + 2(x - 7)(x + 4) + (x - 7)² = 0
(x + 4 + x - 7)² = 0
(2x - 3)² = 0
2x - 3 = 0
2x = 3
x = 1,5

Answer 2

$x^{2} +8x+16+2( x^{2} +4x-7x-28)+ x^{2} -14x+49=0$   
 $x^{2} +8x+16+2 x^{2} +8x-14x-56+ x^{2} -14x+49=0$
$4 x^{2} -12x+9=0$
D=144-144=0 
$x= frac{12}{2*4} = frac{12}{8} =1,5$
Ответ: 1,5