Question

a)4+x(x-4)=x

me ajudem

Answer 1

$4 + x(x - 4) = x$
$4 + x {}^{2} - 4x = x$
$4 + x {}^{2} - 4x - x = 0$
$4 + x {}^{2} + 5x = 0$
$x {}^{2} - 5x + 4 = 0$
$\frac{ - ( - 5) + - \sqrt{( - 5) - 4 \times 1 \times 4} }{2 \times 1}$
$x = \frac{5 + - \sqrt{25 - 16} }{2}$
$x = 5 + - \sqrt{9}$
$\frac{x = 5 + - 3}{2}$
$x = \frac{5 + 3}{2}$
$x = \frac{5 - 3}{2}$
$x1 = 4$
$x2 = 1$