Solve by Factoring (a+1)(a+2)=0

$(a + 1) (a + 2) = 0$

Step 1

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$a + 1 = 0$

$a + 2 = 0$

Step 2

Set $a + 1$ equal to $0$ and solve for $a$ .

Set $a + 1$ equal to $0$ .

$a + 1 = 0$

Subtract $1$ from both sides of the equation.

$a = - 1$

Step 3

Set $a + 2$ equal to $0$ and solve for $a$ .

Set $a + 2$ equal to $0$ .

$a + 2 = 0$

Subtract $2$ from both sides of the equation.

$a = - 2$

Step 4

The final solution is all the values that make $(a + 1) (a + 2) = 0$ true.

$a = - 1, - 2$