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Factor the expression completely.

21, minus, 28, x
21−28x

1 answer

To factor the expression \( 21 - 28x \) completely, we can first look for the greatest common factor (GCF) of the coefficients.

  1. The coefficients are \( 21 \) and \( -28 \). The GCF of \( 21 \) and \( 28 \) is \( 7 \).
  2. We can factor out \( 7 \) from the expression:

\[ 21 - 28x = 7(3 - 4x) \]

Thus, the completely factored form of the expression \( 21 - 28x \) is:

\[ 7(3 - 4x) \]