College Algebra CLEP Prep Practice Exam

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Identify the root of the equation x2 + 4x -21 = 0.

5
-3
7
-7

The correct answer is: -3

The given equation can be factored into (x+7)(x-3)=0. Therefore, the roots of the equation are -7 and 3. Option A, 5, is not a root of the equation. Option C, 7, is also not a root of the equation. Option D, -7, is the root of the equation but it is not the correct answer as it is not the root of x2 + 4x -21 = 0. Thus, the only correct root is -3, making option B the correct answer.