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    Its for my brother, still baffled
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    12x^2 + 9x + 8x + 6
    3x(4x+3) 2(4x+3)
    (4x+3)(3x+2)
    Wow I did that in my head, I'm so proud
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    (Original post by zayn008)
    12x^2 + 9x + 8x + 6
    3x(4x+3) 2(4x+3)
    (4x+3)(3x+2)
    Wow I did that in my head, I'm so proud
    Idk why i struggle with such easy maths when im looking at c1
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    (Original post by BigMan Ting)
    Idk why i struggle with such easy maths when im looking at c1
    Tbh I used to hate this type of factorisation. Could barely do it at AS, I only learnt it because thanks to A2 when doing the product rule
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    A good way to check if you can factorise is see if the discriminant is a perfect square. In this case it's 1 and so you can . If you're bothered you can try to prove it.
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    Strictly speaking any polynomial with degree 2 or more can be factorised.
    For example  x^2-2\equiv (x-\sqrt 2 )(x+\sqrt 2) .
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    (Original post by B_9710)
    Strictly speaking any polynomial with degree 2 or more can be factorised.
    For example  x^2-2\equiv (x-\sqrt 2 )(x+\sqrt 2) .
    True but I think it's more the fact that we want the linear factor to be comprised of integers only rather than reals. This is gcse stuff so they won't give you anything with rationals as far as I know (Don't know about the new spec) and for integers it's true as you need b^2-4ac to be a perfect square otherwise you'll have irrational roots .
 
 
 
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