Help Factoring these problems?
6^2= SIX TO THE 2ND POWER
(1) 6x^2-5xy-4y^2
(2) 12x^2-31x+7
(3) t^2-t-72
(4)8x^3-18X^2-5X
(5)10X^2+10X-60
FACTORING help please!?
2010-10-07 12:45 pm
回答 (2)
2010-10-07 12:48 pm
✔ 最佳答案
(1) 6x^2-5xy-4y^2= (3x - 4y)(2x+y)
(2) 12x^2-31x+7
= (3x-7)(4x-1)
(3) t^2-t-72
= (x-9)(x+8)
(4)8x^3-18X^2-5X
= x (2x-5)(4x+1)
(5)10X^2+10X-60
= 10 (x-2)(x+3)
2010-10-07 7:59 pm
(2) 12x^2-31x+7
=(3x-7)(4x-1)
x=7/3 or x=1/4
(3) t^2-t-72
=(t-9)(t+8)
t=9 or t=-8
(4)8x^3-18X^2-5X
=x(2x-5)(4x+1)
x=0 or x=5/2 or x=-1/4
(5)10X^2+10X-60
=(x-2)(x+3)
x=2 or x=-3
=(3x-7)(4x-1)
x=7/3 or x=1/4
(3) t^2-t-72
=(t-9)(t+8)
t=9 or t=-8
(4)8x^3-18X^2-5X
=x(2x-5)(4x+1)
x=0 or x=5/2 or x=-1/4
(5)10X^2+10X-60
=(x-2)(x+3)
x=2 or x=-3
參考: me
收錄日期: 2021-04-19 23:20:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101007044540AAc6YTp