anonymous
  • anonymous
HOW WULD U FACTOR THIS :)) 10x2 − 7x − 3
Mathematics
schrodinger
  • schrodinger
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NotTim
  • NotTim
Ok, what 2 numbers add to 7 and multiply to the last and first numbers?
anonymous
  • anonymous
4 and 3
NotTim
  • NotTim
and multiply to 30?

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anonymous
  • anonymous
um 3
cwrw238
  • cwrw238
you need to factor 10 and -3 and and combine them so multiplying and addingg will give -7
NotTim
  • NotTim
When I say add, you can 'add' negative nubmers too
anonymous
  • anonymous
umm idk
cwrw238
  • cwrw238
10 * 1 1 * -3
anonymous
  • anonymous
oh ok then wat do i do
cwrw238
  • cwrw238
|dw:1344725357896:dw|
cwrw238
  • cwrw238
the 10 * -1 and 1 * +3 so its (10x + 3)(x - 1)
anonymous
  • anonymous
can u like show me step by step under eachother without drwing
cwrw238
  • cwrw238
well - this is the way i do it you have to consider the possibilities 10 could factor to 5 * 2 or 10 * 1 and -3 could be 1 * -3 or -1 * 3 so you have to try out different combinations so as to obtain -7 (the middle term) thats how i got 10*1 and 1 * -3 - these factor to the form (ax + b)(cx + d) and adx + bcd is the middle term thats how the result is (10x - 3)(x + 1) the (10 * 1) + (-3 * 1) gives the -7
cwrw238
  • cwrw238
these are a bit tricky - and need some practice before you get proficient
anonymous
  • anonymous
8x2 − 11x + 3
anonymous
  • anonymous
how uld i factor this one

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