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Equivalent Expressions

SAT Math· difficulty 3/5

Which is the factored form of 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

Need factors of −21-21 summing to −4-4: −7-7 and 33, giving (x−7)(x+3)(x-7)(x+3).

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