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2.4x²-36x=4x(x-9)=0, x=0 ato x=9
3.x²-81=(x+9)(x-9)=0, mx=9 ato x=-9, no 4 dan lima cara sama
x=0 atau x=-4
2. 4x(x-9)=0
x=0 atau x=9
3. (x+9)(x-9)=0
x=-9 atau x=9
4. (x+11)(x-11)=0
x=-11 atau x=11
6. (x+2)(x+4)=0
x=-2 atau x=-4
7. (x-8)(x+2)=0
x=8 atau x=-2
8. (x-6)(x-8)=0
x=6 atau x=8
9. (x+6)(x+6)=0
x=-6
10. (x-7)(x-7)=0
x=7
12. (x+8)(x-4)=0
x=-8 atau x=4
13. (x-12)(x+14)=0
x=3/2 atau x=-7/4
14. (x-10)(x+4)=0
x=5 atau x=-2
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