Answer:
D. (x - 3)(x + 7)
Step-by-step explanation:
(x - 3)(x + 7)
Step 1. Use FOIL method
=x2 + 7x - 3x - 21
Step 2. Combine like terms
=x2 + 4x - 21
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Answers & Comments
Answer:
D. (x - 3)(x + 7)
Step-by-step explanation:
(x - 3)(x + 7)
Step 1. Use FOIL method
=x2 + 7x - 3x - 21
Step 2. Combine like terms
=x2 + 4x - 21