(4x - 7)(3x + 1)?
回答 (4)
2008-02-13 4:30 am
✔ 最佳答案
(4x - 7)(3x + 1) = 12x²+4x-21x-7= 12x²-17x-7
2008-02-13 12:47 pm
(4x - 7)(3x + 1) = 12x²+4x-21x-7
= 12x²-17x-7
17x=12x²-7
17= (12x²-7)/x
17= 12x-(7/x)
17x=12x-7
17x-12x=-7
5x=-7
x=-7/5
= 12x²-17x-7
17x=12x²-7
17= (12x²-7)/x
17= 12x-(7/x)
17x=12x-7
17x-12x=-7
5x=-7
x=-7/5
2008-02-13 12:38 pm
take 4x multiplied by 3x which equals 12x squared then take 4x times 1 which equals 4x then take the -7 multiplied by 3x which equals -21x then multiply -7 times 1 which equals -7
which looks like 12xsquared + 4x -21x -7
add the x's which equals 17x
the answer= 12(squared) -17x -7
which looks like 12xsquared + 4x -21x -7
add the x's which equals 17x
the answer= 12(squared) -17x -7
2008-02-13 12:28 pm
12x^2 +4x -21x -7 and you add it up
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