PRC-2 · Chapter 1 · Question 41 of 45
If you multiply (x + 3) by (x - 3), the resulting expression is:
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: C) x^2 - 9
Explanation
This follows the 'difference of squares' rule: (a + b)(a - b) = a^2 - b^2. Thus, x^2 - 3^2 = x^2 - 9.
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