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Equivalent Expressions

SAT Math· difficulty 3/5

Which expression is equivalent to x2+4x−21x^2 + 4x - 21?

  • A

    (x−7)(x−3)(x - 7)(x - 3)

  • B

    (x+7)(x+3)(x + 7)(x + 3)

  • C

    (x−7)(x+3)(x - 7)(x + 3)

  • D

    (x+7)(x−3)(x + 7)(x - 3)

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Explanation

Two numbers multiplying to −21-21, summing to 44: 77 and −3-3. So (x+7)(x−3)(x+7)(x-3).

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