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# Math C2 Algebra and Functions help watch

1. Hi, I dont know how to solve this question at all. Please do help

Given that -1 is a root of the equation 2x^3 - 5x^2 - 4x +3, find the two positive roots.

The answer in the book is 1/2 and 3.
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3. The image you attached is correct? Strictly speaking it should be "x = -1 is a root of the equation 2x^3 - 5x^2 - 4x + 3 = 0"
4. (Original post by Naika98)

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Please don't post full solutions - it's against Forum rules
5. (Original post by Ugarit)
Hi, I dont know how to solve this question at all. Please do help

Given that -1 is a root of the equation 2x^3 - 5x^2 - 4x +3, find the two positive roots.

The answer in the book is 1/2 and 3.
You don't have an equation there - did you mean 2x^3 -5x^2 - 4x + 3 = 0?

Do you know what the factor theorem tells you?

Do you know how to do polynomial long division (or the equivalent by equating coefficients)?
6. (Original post by davros)
Please don't post full solutions - it's against Forum rules
Oh dear, for some reason I thought the person who posted the photo was OP silly me
7. (Original post by davros)
You don't have an equation there - did you mean 2x^3 -5x^2 - 4x + 3 = 0?

Do you know what the factor theorem tells you?

Do you know how to do polynomial long division (or the equivalent by equating coefficients)?
In the book, the '=0' isnt written.
But Thank you so much
I did the long division, (divided 2x^3 -5x^2 - 4x + 3 by x+1) and then factorised, and my answers were correct

It completely slipped my mind that when they say -1 is a root of the equation, it means you can divide by x+1 with no remainder
8. Thanks for your help everyone!! Turns out all I needed to do was divide the equation by x+1 and then factorise. I feel silly for asking

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