Answer:
100q² + 70q - 70q - 49
=100q² - 49
=4x²y + 12xy²
= -5a²c - 10abd
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Answers & Comments
Answer:
1. (10q - 7)(10q + 7)
100q² + 70q - 70q - 49
=100q² - 49
2. 4xy(x + 3y)
=4x²y + 12xy²
3. -5a(ac + 2bd)
= -5a²c - 10abd