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HELP! Do you loose marks if.. watch

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    Hey, I was wondering whether any of you knew wheter you are going to loose marks on a P1 paper if you'd used the formula (-b+-sqrt b^-4ac)/2 to find the roots instead of directly putting the values into brackets? any help would be appreciated...
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    You mean instead of factorising? Nah, you shouldn't.
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    yup, i meant factorising. i was wondering cos 5 minutes ago i was doin a p2 paper and i marked it according to the marking scheme and in there they'd factorise the equation and say nothing about using the formula, which sometimes can be ways easier!
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    (Original post by Kiril)
    yup, i meant factorising. i was wondering cos 5 minutes ago i was doin a p2 paper and i marked it according to the marking scheme and in there they'd factorise the equation and say nothing about using the formula, which sometimes can be ways easier!
    if the quadratic factorises into two brackets then you will get an exact answer, which you will get from the formula as well so it really doesnt matter. obviously if the question asks you to factorise then you should, but otherwise it shouldnt make a difference. you can always check if the quadratic will factorise before trying to by seeing whether the root of (b^2 - 4ac) is an exact number
 
 
 
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