Which of the following equations has a root in common with

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by Scott@TargetTestPrep » Wed Jul 10, 2019 4:20 pm
swerve wrote:Which of the following equations has a root in common with \( m^2+4m+4=0\)?

A. \(m^2-4m+4=0\)

B. \(m^2+4m-3=0\)

C. \(m^2-4=0\)

D. \(m^2+m-6=0\)

E. \(m^2+5m+4=0\)

The OA is C

Source: Princeton Review
Solving the given equation, we have:

(m + 2)^2 = 0

m + 2 = 0

m = -2

Looking at the given choices, we see that

m^2 - 4 = 0

(m + 2)(m - 2) = 0

m = -2 or m = 2

We see that the equation m^2 - 4 = 0 has a root in common with the given equation; thus choice C is the correct answer.

Answer: C

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