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2x^2-3x-5=0 16x^2-24x-40=0 16x^2-24x+9-49=0 (4x-3)^2-49=0 (4x+4)(4x-10)=0 x1=-1 x2=2.5 座標(-1,0),(2.5,0) 【又】 x=-1 2x^2-3x-5=0 2x^2+2x-(5x+5)=0 (x+1)(2x-5)=0 x1=-1 x2=2.5
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