factorise 1 - 4 (p + q)2
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Answer:
(1+2p+2q)(1-2p-2q)
Step-by-step explanation:
1 - 4 (p + q)²
= 1² - 2²*(p+q)²
= 1² - (2p+2q)²
= (1+2p+2q)(1-2p-2q)
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