Question

решите уравнение 3x²+5х=2-2х-х²

Answer 1

$({3 x}^{2} + {x}^{2} ) +( {5x} + 2x ) - 2 = \ = 0 \ {4x}^{2} + {7x } - 2 = 0$
D=${b}^{2} - 4ac$
D= 49-4*4*(-2) =49+32=81=9^2
$x1 = frac{ - b + sqrt{d} }{2a} \ x1 = frac{ - 7 + 9}{8} \ x1 = frac{2}{8} = frac{1}{4}$
$x2 = frac{ - b - sqrt{d} }{2a} \ x2 = frac{ - 7 - 9}{8} \ x2 = frac{ - 16}{8} = - 2$
Ответ: 0.25;-2