College Algebra CLEP Prep Practice Exam

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Solve for x in the equation x2 – 9 = 0

–3 and 3
0 and 9
–9 and 0
9 and 0

The correct answer is: –3 and 3

The correct solution is A –3 and 3. The equation is in the form of x^2 – 9, which can be factored into (x – 3)(x + 3). In order for this to equal 0, either x – 3 must equal 0 or x + 3 must equal 0. Solving for x in each case gives –3 and 3 as the solutions. The other options, B, C, and D, are incorrect because they do not satisfy the equation x^2 – 9 = 0. Option B does not have two solutions and options C and D have swapped the signs.