Question

Помогите решить систему
{ х+c=10
х*(x+c) =30

Answer 1

Ответ:

$left { {{x=10-c} atop {x*(x+c)=30}} right. \(10-c)=(10-c+c)=30\c=7\x=10-7\x=3\(x,c)=(3,7)$

Объяснение:

Answer 2

$displaystyle tt left { {{x+c=10} atop {x(x+c)=30}} right. to left { {{x=10-c} atop {x(x+c)=30}} right. \\displaystyle tt (10-c)(10-c+c)=30\displaystyle tt (10-c)cdot10=30\displaystyle tt 100-10c=30\displaystyle tt -10c=30-100\displaystyle tt -10c=-70\displaystyle tt c=frac{-70}{-10}\displaystyle tt underline{bold{c=7}}$

$displaystyle tt x=10-c=10-7=bold{3}$

Ответ: $displaystyle tt (c;:x)=(7;:3)$