- #1

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Would random plugging in numbers into w effective? If not, please help me out... I know how to get to the answer i just need a better grasp on methods

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- Thread starter venger
- Start date

- #1

- 58

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Would random plugging in numbers into w effective? If not, please help me out... I know how to get to the answer i just need a better grasp on methods

- #2

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- #3

Homework Helper

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Would random plugging in numbers into w effective? If not, please help me out... I know how to get to the answer i just need a better grasp on methods

You mean, you need to solve for w? In that case, do you know how to find the roots of a quadratic equation?

- #4

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here i go...

w^2+12W-135= 0

then blah blah blah quadratic formula.

w^2+12W-135= 0

then blah blah blah quadratic formula.

- #5

Staff Emeritus

Science Advisor

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Your equation is not correct; it should be a cubic. The method I suggested to you regarding a different cubic equation was not simply "randomly substitute numbers." You make an educated guess as to what the value of w could be (note, it must be a factor of 135) and then see if it solves the equation.

- #6

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- #7

Staff Emeritus

Science Advisor

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Is a cubic equation a quadratic equation?

Thus, can we use the quadratic equation to solve it?

Answer these and the answer to your question will be obvious.

I'm going to leave this to someone else now, since I don't think you're reading my posts; and if you are, you're definitely not thinking about the questions and points I'm posing to you.

- #8

- 58

- 0

V=LW^2

135=(w+12)w^2

0=(w^2+12w-135)W

Am i right so far?

- #9

- 340

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Check your algebra.

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