Factor completely: x² − 9
Correct answer: A. (x + 3)(x − 3)
x² − 9 is a difference of two squares, a² − b² = (a + b)(a − b), with a = x and b = 3. Check by multiplying: (x + 3)(x − 3) = x² − 3x + 3x − 9 = x² − 9.
medium
Answer and explanation
The correct answer is A. (x + 3)(x − 3)
x² − 9 is a difference of two squares, a² − b² = (a + b)(a − b), with a = x and b = 3. Check by multiplying: (x + 3)(x − 3) = x² − 3x + 3x − 9 = x² − 9.
Topic: Algebra and Equations MCQs · Subject: Numerical Ability