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標題:
F.4 Maths (急急急) THX !!!
發問:
Solve each of the following equations using the factor method. 1. x^2 + 6x = 0 2. x^2 + x - 42 = 0 3. 3x^2 - 5x + 2 = 0 4. 4x^2 - 9 = 0 5. 2x^2 - 32 = 0 6. 4x^2 - 20x + 25 = 0 7. 3x^2 - 60 + 3x = 0
最佳解答:
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1．x^2+6x=0 x(x+6)=0 x=0 or x= -6 2. x^2 +x -42 =0 (x+7)(x-6)=0 x=-7 x=6 3. 3x^2-5x+2=0 (x-1)(3x-2)=0 x=1 or x= 2/3 4. 4x^2-9=0 4x^2 = 9 左右開方 2x= 正負3 x = 3/2or x= - 3/2 5. 2x^2 - 32=0 2x^2=32 x^2=16 左右開方 x=正負4 x=4 or x=-4 6. 4x^2 - 20x + 25= 0 (2x-5)(2x-5)=0 x=5 7. 3x^2 -60 +3x=0 3x^2 + 3x -60=0 (3x-12)(x+5)=0 x=4 or x= -5
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