Question

Solve the given equation by undoing the operations:
$x+5=0$

• A. $x=0$
• B. $x=5$
• C. $x=-5$
• D. $x=50$

Answer 1

The correct option is C $x=-5$

Given, the equation is $x+5=0.$

Isolate the variable and solve the equation.
To isolate the variable, we need to perform some operations that two operations undo each other.
$\Rightarrow$ Addition and subtraction undoes each other
$\Rightarrow$ Multiplication and division undoes each other

In the given equation, 5 is added on left hand side of the equation. So we need to undo the addition operation by subtracting 5 to both sides of the equation.
$\Rightarrow x+5=0$
$-5=-5$
$--------$
$x+0=-5$
$\Rightarrow x=-5$

Hence, the solution of the equation $x+5=0$ is $x=-5.$