Question 3(1 point) Multiply. (a-3)(a+3) a a^2-6 b a^2+6a-9 C a^2-6a-9 d a^2-9

To multiply the given expression \((a-3)(a+3)\), we can use the distributive property (also known as the FOIL method for binomials). Here's the step-by-step process:<br /><br />1. Multiply the first terms: \(a \cdot a = a^2\)<br />2. Multiply the outer terms: \(a \cdot 3 = 3a\)<br />3. Multiply the inner terms: \(-3 \cdot a = -3a\)<br />4. Multiply the last terms: \(-3 \cdot 3 = -9\)<br /><br />Now, combine the like terms:<br /><br />\[ a^2 + 3a - 3a - 9 = a^2 - 9 \]<br /><br />So, the correct answer is:<br /><br />d) \(a^2 - 9\)