Question

Решите уравнение!!! x^2-15x-34=0

Answer 1

(-15x=-17x+2x)

x²+2x-17x-34=0

x(x+2)-17(x+2)=0

(x-17)(x+2)=0

x1 = 17

x2 = -2

Answer 2

D=b²-4ac=225+34×4=225+136=361=19²
$x = \frac{ - b + - d}{ 2a} = \frac{15 + - 19}{2} =$
$x1 = \frac{34}{2} = 17$
$x2 = \frac{ - 4}{2} = - 2$
Ответ: 17, -2