jazzyfa30
factoring:
x2  3x  28 = 0



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jazzyfa30
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@Kidkush24 help

hartnn
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can you find 2 numbers whose sum is 3 and product is 28 ?

jazzyfa30
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7 and 4

hartnn
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one of them is negative, which ?

jazzyfa30
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7 and 4

hartnn
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correct!
so, split up 3x as 7x+4x
x^2 7x+4x28
now factor out x from first 2 terms and 4 from last two, can you ?

jazzyfa30
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ummmm idthink so

hartnn
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ok, to factor out x from x^27x, we get x (x7)
and 4 from 4x28. we get +4(x7)
so, x(x7)+4(x7)
factor out (x7) from this!

jazzyfa30
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7 4(x7)??????

hartnn
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if you take (x7) out from those 2 terms, what remains is
(x7) (x+4)
thats it! factored.....

hartnn
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and don't forget the = 0
(x7)(x+4) = 0
do you need to solve it too ? or just factoring ?

jazzyfa30
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just factor can u help me with a few more

hartnn
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did you get this one properly ?

jazzyfa30
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yes

hartnn
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yeah, then i can help u with next problems...just post them in a new post...so that if i am busy, others can help you too!