Simplify (x-3)(x+7)

$(x - 3) (x + 7)$

Step 1

Expand $(x - 3) (x + 7)$ using the FOIL Method.

Apply the distributive property.

$x (x + 7) - 3 (x + 7)$

Apply the distributive property.

$x \cdot x + x \cdot 7 - 3 (x + 7)$

Apply the distributive property.

$x \cdot x + x \cdot 7 - 3 x - 3 \cdot 7$

$x \cdot x + x \cdot 7 - 3 x - 3 \cdot 7$

Step 2

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

$x^{2} + x \cdot 7 - 3 x - 3 \cdot 7$

Move $7$ to the left of $x$ .

$x^{2} + 7 \cdot x - 3 x - 3 \cdot 7$

Multiply $- 3$ by $7$ .

$x^{2} + 7 x - 3 x - 21$

$x^{2} + 7 x - 3 x - 21$

Subtract $3 x$ from $7 x$ .

$x^{2} + 4 x - 21$

$x^{2} + 4 x - 21$

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