C1 - Quadratic Functions (Finding the roots of an equation) Watch

blackdiamond97
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So I've tried this question where I have to find the roots of the equation shown in the picture, but for some reason I have gotten the answer wrong, as it's supposed to be 1\pm\sqrt {13} instead of 1\pm\sqrt {10}. Can anyone give me hints as to where I went wrong? Thank you
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(Original post by blackdiamond97)
So I've tried this question where I have to find the roots of the equation shown in the picture, but for some reason I have gotten the answer wrong, as it's supposed to be 1\pm\sqrt {13} instead of 1\pm\sqrt {10}. Can anyone give me hints as to where I went wrong? Thank you
you should have -48 in the discriminant, not -36
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senseixD
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What is 4x12?
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Alchemise
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(Original post by senseixD)
What is 4x12?
21
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blackdiamond97
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Wow, that reply was quick :eek: Oh okay, so my mistake was multiplying the unsimplified equation by 2 first as opposed to simplifying the equation first then multiplying by 2? :facepalm: thank you!

Edit: hang on, so it's nothing to do with the above?
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blackdiamond97
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(Original post by senseixD)
What is 4x12?
I feel beyond stupid.
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senseixD
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(Original post by blackdiamond97)
I feel beyond stupid.
it's ok, everyone has those moments
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