Homework Help

How do you factor the equation 2w^2 + 3w - 90?

user profile pic

chocolate975 | Student, Undergraduate | eNoter

Posted May 3, 2010 at 7:14 AM via web

dislike 1 like

How do you factor the equation 2w^2 + 3w - 90?

Tagged with algebra, factoring, math

2 Answers | Add Yours

Top Answer

user profile pic

neela | High School Teacher | Valedictorian

Posted May 3, 2010 at 9:37 AM (Answer #1)

dislike 1 like

To factor 2w^2+3w-90.

Solution:

The first term is 2w^2 and the last term is -90. Their product is 2w^2(-90) = -180w^2.. The factors of -180w^2 in such way that the sum of the factors is middle term,3w of the given quadratic is. -180w^2 = (15w)(-12w). And  (15w)+(-12w)=3w.

Now we can can group the given quadratic splitting the middle term into 15w and -12w as below:

2w^2+15w-12w-90

=w(2w+15)-6(2w+15)

=(2.w+15)(w-6)

user profile pic

krishna-agrawala | College Teacher | Valedictorian

Posted May 3, 2010 at 11:24 AM (Answer #2)

dislike 0 like

The given expression is:

2w^2 + 3w - 90

(Please note that it is just an expression, not an equation)

We can find factors of this expression by modifying it in equivalent expression in following steps:

2w^2 - 12w + 15w - 90

2w(w - 6) + 15(w - 6)

(w - 6)(2w + 15)

Answer:

Factors of the given expression are (w - 6) and (2w + 15).

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes