Factorise: 4a² – 12a + 9 - x² + 2xy – y²
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4a² – 12a + 9 - x² + 2xy – y²
(2a)² - 2 * 2a * 3 + (3)² - (x² - 2xy + y²)
(2a - 3)² - (x + y)²
(2a - 3 + x + y)(2a - 3 - x - y)
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★ Indentity Used:
- (a - b)² = a² - 2ab + b²
- a² - b² = (a + b)(a - b)
UnTitled:
Thx
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