Question

Tìm X
3x2-3x×(x-2)-12=0

Answer 1

`3x^2-3x\left(x-2\right)-12=0`

`3x^2-3x\left(x-2\right)-12+12=0+12 \longleftarrow (\mathrm{Add\:}12\mathrm{\:to\:both\:sides})`

`3x^2-3x\left(x-2\right)=12`

`-3x\left(x-2\right)=-3xx-\left(-3x\right)\cdot \:2`

`=-3xx+3\cdot \:2x`

`-3xx+3x^(2)`

`=3x^(1+1)`

`=3x^2`

`3\cdot \:2x=6x`

`=-3x^2+6x`

`3x^2-3x^2+6x=12\Longleftarrow Add\:similar\:elements`

`6x=12`

`(6x)/(6)=(12)/(6) \Longleftarrow Divide`

`x=2`

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OAmalOHopeO

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