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標題:
因式分解~~~~~~~~~~~~~
發問:
因式分解 x^2 - 8x - y^2 + 10y - 9
最佳解答:
x^2 - 8x - y^2 + 10y - 9 =(x^2 - 8x +16) -16 - (y^2 - 10y +25) +25 - 9 =(x - 4)^2 - (y - 5)^2 -16 +25 - 9 =(x - 4)^2 - (y - 5)^2 <---difference of two squares =[(x - 4)+ (y - 5)][(x - 4)- (y - 5)] =(x+ y - 9)(x - y + 1)
(x-9)(x+1)-y(y-10) ........... 應該係無法分解|||||x^2-8x+7-y^2+10y-16 (ps.-9=7-16) (x-1)(x-7)-(y-2)(y-8)
因式分解~~~~~~~~~~~~~
發問:
因式分解 x^2 - 8x - y^2 + 10y - 9
最佳解答:
x^2 - 8x - y^2 + 10y - 9 =(x^2 - 8x +16) -16 - (y^2 - 10y +25) +25 - 9 =(x - 4)^2 - (y - 5)^2 -16 +25 - 9 =(x - 4)^2 - (y - 5)^2 <---difference of two squares =[(x - 4)+ (y - 5)][(x - 4)- (y - 5)] =(x+ y - 9)(x - y + 1)
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其他解答:(x-9)(x+1)-y(y-10) ........... 應該係無法分解|||||x^2-8x+7-y^2+10y-16 (ps.-9=7-16) (x-1)(x-7)-(y-2)(y-8)
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