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sveta [45]
2 years ago
11

Factorise completely: 1. 3xy - x2. 4a² - 9​

Mathematics
1 answer:
Amanda [17]2 years ago
6 0

Answer:

x(3y - 1) and (2a - 3)(2a + 3)

Step-by-step explanation:

(1)

3xy - x ← factor out x from each term

= x(3y - 1)

(2)

4a² - 9 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b) , then

4a² - 9

= (2a)² - 3²

= (2a - 3)(2a + 3)

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