What is the answer to: factor 5x^2+x-1
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What is the answer to: factor 5x^2+x-1

[From: ] [author: ] [Date: 12-04-09] [Hit: ]
5. None of those combinations add up to 1. Therefore, this expression cannot be factored.x= 0.x= -0.......
factor 5x^2+x-1

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Cannot be factored

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a factor is something of the form (x-a) where a is a root of the equation
so first find the roots using the quadratic equation
.you will get your two roots a and b from that eqn

Then simply make the factors as above. SO you will have (x-a) and (x-b) being your two factors

THen remember a quadratic is the product of its two factors. so your final answer will be (x-a)*(x-b)

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To start factoring this, you would multiply 5 * -1 and get -5. Then you need to find factors of -5 that add to 1. Factors of -5 are: 1, -5, -1, 5. None of those combinations add up to 1. Therefore, this expression cannot be factored.

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quadratic formula

x= 0.36
x= -0.56

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Use the quadratic formula to get: (-1 +/- sqrt(21) ) / 10

You can do it from there
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