Solve each following equations using the factor method. （列明步驟）
1) 3x2 – 5x + 2 = 0
2) 18x2 – 15x = 18
3) ( 2 + x ) ( x - 7 ) = 2 + x
F4 Math (3 questions)
2007-09-09 9:13 am
回答 (3)
2007-09-09 9:21 am
✔ 最佳答案
1) 3^2 – 5x + 2 = 0(x-1)(3x-2)=0
x=1 or 2/3
2) 18^2 – 15x = 18
18^2-15x-18=0
3(3x+2)(2x-3)=0
x=-2/3 or 3/2
3) ( 2 + x ) ( x - 7 ) = 2 + x
( 2 + x ) ( x - 7 ) -(2 + x)= 0
(2+x)(x-7-1)=0
(2+x)(x-8) =0
x= -2 or 8
2007-09-09 9:24 am
1)
(x-1)(3x-2)=0
x=1or2/3
2)
18x^2-15x-18=0
(2x-1)(3x+2)=0
x=-1/2or-2/3
3)
x^2-6x-16=0
(x-8)(x+2)=0
x=8or-2
(x-1)(3x-2)=0
x=1or2/3
2)
18x^2-15x-18=0
(2x-1)(3x+2)=0
x=-1/2or-2/3
3)
x^2-6x-16=0
(x-8)(x+2)=0
x=8or-2
2007-09-09 9:24 am
1)
3x^2 – 5x + 2 = 0
(x-1)(3x-2) = 0
x = 1 or 2/3
2)
18x^2 – 15x = 18
6x^2 - 5x = 6
(2x-3) (3x+2) = 0
x = 1.5 or -2/3
3)
( 2 + x ) ( x - 7 ) = 2 + x
(2 + x ) [ (x - 7) -1 ] = 0
x = -2 or 8
3x^2 – 5x + 2 = 0
(x-1)(3x-2) = 0
x = 1 or 2/3
2)
18x^2 – 15x = 18
6x^2 - 5x = 6
(2x-3) (3x+2) = 0
x = 1.5 or -2/3
3)
( 2 + x ) ( x - 7 ) = 2 + x
(2 + x ) [ (x - 7) -1 ] = 0
x = -2 or 8
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