Factor? 2x^2+15xy-27y^2?
回答 (6)
2008-04-06 3:59 pm
✔ 最佳答案
2x^2+15xy-27y^2 =(2x-3)(x+9)
2008-04-06 4:03 pm
2x^2 + 15xy - 27y^2
= (2x - 3y)(x + 9y)
= (2x - 3y)(x + 9y)
2008-04-06 4:00 pm
(2x-3y)(x+9y)
2008-04-06 4:07 pm
2x^2+18xy-3xy-27y^2
2x(x+9y)-3y(x+9y)
(x+9y)(2x-3y)
2x(x+9y)-3y(x+9y)
(x+9y)(2x-3y)
2008-04-06 4:04 pm
2x^2 + 15xy - 27y^2
2(-27) = - 54
Look for factors of - 54 that add to + 15
- 3 & + 18 do it
2x^2 - 3xy + 18xy - 27y^2 {rewrite for grouping}
x(2x - 3y) + 9y(2x - 3y)
(x + 9)(2x - 3y)
2(-27) = - 54
Look for factors of - 54 that add to + 15
- 3 & + 18 do it
2x^2 - 3xy + 18xy - 27y^2 {rewrite for grouping}
x(2x - 3y) + 9y(2x - 3y)
(x + 9)(2x - 3y)
2008-04-06 3:59 pm
2x^2+15xy-27y^2
okay the thing is that i think the sign before 27y^2 shud be +
otherwise middle term factorization wont work here
then u have to use the quadratic formula which wud be complicated
okay the thing is that i think the sign before 27y^2 shud be +
otherwise middle term factorization wont work here
then u have to use the quadratic formula which wud be complicated
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