因式分解以下题目，並 列步骤 X^2-X-12?
回答 (2)
2016-03-28 11:20 am
x² - x - 12
= x² + (3x - 4x) - 12
= (x² + 3x) + (-4x - 12)
= x(x + 3) - 4(x + 3)
= (x + 3)(x - 4)
= x² + (3x - 4x) - 12
= (x² + 3x) + (-4x - 12)
= x(x + 3) - 4(x + 3)
= (x + 3)(x - 4)
2016-03-29 3:22 am
X^2-X-12
=(x-4)(x+3)
=(x-4)(x+3)
收錄日期: 2021-04-18 14:40:55
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