Factorizes :
1. y^2 + 11y + 18 = ???????
2. a^2 - b^2 + ay - by = ????????
Maths - Factorizes
2006-11-08 1:01 am
回答 (2)
2006-11-08 1:08 am
✔ 最佳答案
1. y^2 + 11y + 18 = y^2 + 9y + 2y + 18 =
y(y + 9) + 2(y + 9) =
(y + 2)(y + 9)
2. a^2 - b^2 + ay - by =
(a + b)(a - b) + y(a - b) =
(a + y)(a - b)
2006-11-07 17:09:59 補充：
補充:2. a^2 - b^2 + ay - by = (a + b)(a - b) + y(a - b) =(a + b + y)(a - b)
2006-11-08 1:16 am
1.y^2+11y+18=
2 y
x
9 y(cross method)
=2y+9y=11y
so the answer is (2+y)(9+y)
2.a^2-b^2+ay-by
=(a+b)(a-b)+y(a-b)then
[by taking out common factor (a-b)]
so the answer =(a-b)(a+b+y)
That's all
2 y
x
9 y(cross method)
=2y+9y=11y
so the answer is (2+y)(9+y)
2.a^2-b^2+ay-by
=(a+b)(a-b)+y(a-b)then
[by taking out common factor (a-b)]
so the answer =(a-b)(a+b+y)
That's all
參考: me
收錄日期: 2021-04-12 18:09:53
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