Factorize 6ab - a² - 9b²
Factorize 4x² + 12x + 9 -25y² (4x²+12x+9係=(2x+3)²)
F.3 Maths`
2010-09-10 4:54 am
回答 (1)
2010-09-10 5:04 am
✔ 最佳答案
6ab - a² - 9b²= - (a² - 6ab + 9b²)= - [a² - 2a(3b) + (3b)²]= - (a - 3b)²4x² + 12x + 9 -25y² = (2x+3)² - (5y)² = (2x+3 - 5y)(2x+3 + 5y)= (2x - 5y + 3)(2x + 5y + 3)
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