Precalculus Examples

$x = 0$ , $x = - 4$

Since the roots of an equation are the points where the solution is $0$ , set each root as a factor of the equation that equals $0$ .

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

Simplify.

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Apply the distributive property.

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

Simplify the expression.

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Multiply $x$ by $x$ .

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

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

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

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