Question

15+3(x+1)=x^2+3x x(x-1)=9-x

Answer 1

15+3=18
Ну так я просто не куда девать свои слова)

Answer 2

Let's solve each equation step by step:

1. 15 + 3(x + 1) = x^2 + 3x

Let's simplify the equation:

15 + 3x + 3 = x^2 + 3x

Combine like terms:

18 + 3x = x^2 + 3x

Subtract 3x from both sides to eliminate the variable term:

18 = x^2

Now, take the square root of both sides:

√18 = ±√(x^2)

Simplify:

±3√2 = x

So the solutions to the first equation are x = 3√2 and x = -3√2.

2. x(x - 1) = 9 - x

Expand the equation:

x^2 - x = 9 - x

Add x to both sides to eliminate the variable term:

x^2 - x + x = 9

Simplify:

x^2 = 9

Take the square root of both sides:

√(x^2) = ±√9

Simplify:

x = ±3

So the solutions to the second equation are x = 3 and x = -3.

Therefore, the solutions to the system of equations are x = 3√2, x = -3√2, x = 3, and x = -3.