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Multiple choice

Number of common roots of the equation $\displaystyle x^{3}-2x^{2}-x+2=0$ and $\displaystyle x^{3}+6x^{2}+11x+6=0$ is

  1. zero

  2. one

  3. two

  4. three

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The first equation factors to (x-1)(x+1)(x-2) = 0, roots are 1, -1, 2. The second factors to (x+1)(x+2)(x+3) = 0, roots are -1, -2, -3. The only common root is -1.

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