更新1:
factorize
(A)-4x^2-4x+1 (B)-By the result of a,4x^2-4x-15?
回答 (2)
2015-09-23 3:03 pm
(A)-
4x² - 4x + 1 = (2x)² - 2(2x)(1) + 1² = (2x - 1)²
(B)-
By the result of a, 4x² - 4x - 15 = (4x² - 4x + 1) - 16
= (2x - 1)² - 16 = (2x - 1)² - 4² = (2x - 1 - 4) (2x - 1 + 4) = (2x - 5) (2x + 3)
4x² - 4x + 1 = (2x)² - 2(2x)(1) + 1² = (2x - 1)²
(B)-
By the result of a, 4x² - 4x - 15 = (4x² - 4x + 1) - 16
= (2x - 1)² - 16 = (2x - 1)² - 4² = (2x - 1 - 4) (2x - 1 + 4) = (2x - 5) (2x + 3)
2015-09-25 2:28 pm
(a)
4x² - 4x + 1
=(2x - 1)²
(b)
4x² - 4x - 15
=(4x²-4x+1)-16
=(2x-1)²-16
=(2x-1-4) (2x-1+4)
=(2x-5)(2x+3)
4x² - 4x + 1
=(2x - 1)²
(b)
4x² - 4x - 15
=(4x²-4x+1)-16
=(2x-1)²-16
=(2x-1-4) (2x-1+4)
=(2x-5)(2x+3)
收錄日期: 2021-04-18 00:17:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150923032249AA1o7iE