Berapa hasil persamaan kuadrat

Berapa hasil persamaan kuadrat

Penjelasan dengan langkah-langkah:

$.) {2x}^{2} - 2x = 8 \ {2x}^{2} - 2x - 8 = 0 \ frac{(2x + 2)(2x - 8)}{2} = 0 \ (x + 1 )(2x - 8) = 0 \ x + 1 = 0/2x - 8 = 0 \ x = - 1/2x = 8 \ /x = frac{8}{2} = 4$

$x {}^{2} - 2x = 8 \ {x}^{2} - 2x - 8 = 0 \ ( x + 2)(x - 4) = 0 \ x + 2 = 0/x - 4 = 0 \ x = - 2/x = 4$