Solve left(a+3right)left(a^2+9right)left(a-3right)

$$\left( a+3 \right) \left( { a }^{ 2 } +9 \right) \left( a-3 \right)$$

Evaluate

$$a^{4}-81$$

Solution Steps

Use the distributive property to multiply a+3 by a^{2}+9.

$$\left(a^{3}+9a+3a^{2}+27\right)\left(a-3\right)$$

Use the distributive property to multiply a^{3}+9a+3a^{2}+27 by a-3 and combine like terms.

$$a^{4}-81$$

Expand

$$a^{4}-81$$

Solution Steps

Use the distributive property to multiply a+3 by a^{2}+9.

$$\left(a^{3}+9a+3a^{2}+27\right)\left(a-3\right)$$

Use the distributive property to multiply a^{3}+9a+3a^{2}+27 by a-3 and combine like terms.

$$a^{4}-81$$