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

$x (x + 3) = 4$

Subtract $4$ from both sides of the equation.

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

Simplify each term.

Apply the distributive property.

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

Multiply $x$ by $x$ .

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

Move $3$ to the left of $x$ .

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

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

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

The standard form is $x^{2} + 3 x - 4$ .

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