zahabaha
HOW WULD U FACTOR THIS :)) 10x2 − 7x − 3
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NotTim
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Ok, what 2 numbers add to 7 and multiply to the last and first numbers?
zahabaha
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4 and 3
NotTim
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and multiply to 30?
zahabaha
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um 3
cwrw238
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you need to factor 10 and -3 and and combine them so multiplying and addingg will give -7
NotTim
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When I say add, you can 'add' negative nubmers too
zahabaha
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umm idk
cwrw238
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10 * 1
1 * -3
zahabaha
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oh ok
then wat do i do
cwrw238
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|dw:1344725357896:dw|
cwrw238
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the 10 * -1 and 1 * +3
so its
(10x + 3)(x - 1)
zahabaha
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can u like show me step by step under eachother without drwing
cwrw238
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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
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these are a bit tricky - and need some practice before you get proficient
zahabaha
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8x2 − 11x + 3
zahabaha
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how uld i factor this one