a. (y+7) (y-7)
b. (y-7)(y-7)
c. (y+49)(y-49)
d.(y2+7)(y2-7)
what is the factor for y2 - 49?
2009-04-20 2:48 pm
回答 (12)
2009-04-20 2:55 pm
✔ 最佳答案
y² - 49 is the DIFFERENCE OF SQUARES. You need to recognize this form of polynomial!a² - b² = (a+b)(a-b)
2009-04-20 4:58 pm
Option a
y² - 49 = (y - 7)(y + 7)
y² - 49 = (y - 7)(y + 7)
2009-04-20 4:25 pm
a^2 - b^2 = (a + b)(a - b)
y^2 - 49
= y^2 - 7^2
= (y + 7)(y - 7)
(answer a)
y^2 - 49
= y^2 - 7^2
= (y + 7)(y - 7)
(answer a)
2009-04-20 3:00 pm
option A
2009-04-20 2:58 pm
(a^2 - b^2) = (a + b)(a - b)
(y^2 - 49) = (y^2 - 7^2)
= (y + 7)(y - 7)
Ans. (A) = (y + 7)(y - 7)
(y^2 - 49) = (y^2 - 7^2)
= (y + 7)(y - 7)
Ans. (A) = (y + 7)(y - 7)
2009-04-20 2:54 pm
aaa
2009-04-20 2:54 pm
Use (a^2 - b^2) = (a+b) (a-b)
So (y^2- 49) = (y^2 - 7^2)
= (y+7)(y-7)
So (y^2- 49) = (y^2 - 7^2)
= (y+7)(y-7)
2009-04-20 2:54 pm
a^2 - b^2 = (a - b) (a + b)
= y^2 - 49
= y^2 - 7^2
= (y - 7) (y + 7) Option A.
= y^2 - 49
= y^2 - 7^2
= (y - 7) (y + 7) Option A.
參考: Dont Ask...
2009-04-20 2:53 pm
A . (y+7) (y-7)
2009-04-20 2:53 pm
y² - 49 = (y + 7)(y -7)
Answer a)
Answer a)
收錄日期: 2021-05-01 12:18:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090420064843AAKWHSO