the solution set for x^2 -x -56=0 is

A.{7,8}

b. {-7}

c. {8}

d. {-7,8}

e. {7.-8}

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the solution set for x^2 -x -56=0 is

A.{7,8}

b. {-7}

c. {8}

d. {-7,8}

e. {7.-8}

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I believe the answer is E