Write in Standard Form (x+3)(x+4)=0

$(x + 3) (x + 4) = 0$

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

$a x^{2} + b x + c = 0$

Expand $(x + 3) (x + 4)$ using the FOIL Method.

Apply the distributive property.

$x (x + 4) + 3 (x + 4) = 0$

Apply the distributive property.

$x \cdot x + x \cdot 4 + 3 (x + 4) = 0$

Apply the distributive property.

$x \cdot x + x \cdot 4 + 3 x + 3 \cdot 4 = 0$

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

$x^{2} + x \cdot 4 + 3 x + 3 \cdot 4 = 0$

Move $4$ to the left of $x$ .

$x^{2} + 4 \cdot x + 3 x + 3 \cdot 4 = 0$

Multiply $3$ by $4$ .

$x^{2} + 4 x + 3 x + 12 = 0$

Add $4 x$ and $3 x$ .

$x^{2} + 7 x + 12 = 0$