Question

Решить уравнение:
x
3
−
8
x
+
7
=
0
.

Answer 1

Ответ:

x³ - 7x - x + 7 = 0

x(x²-1) -7(x-1)=0

x(x-1)(x+1)-7(x-1)=0

(x-1)(x²+x-7)=0

x-1=0

x²+x-7=0

Answer 2

$3x - 8x + 7 = 0$

$3x - 8x = 0 - 7$

$- 5x = - 7$

$x = - 7 \div 5$

$x = - 1.4$