Bananas1234
  • Bananas1234
Solve for x. 3x2 – 12 = 0
Mathematics
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Bananas1234
  • Bananas1234
Solve for x. 3x2 – 12 = 0
Mathematics
jamiebookeater
  • jamiebookeater
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hockeychick23
  • hockeychick23
first step is to get 3x^2 by itself so we do: 3x^2-12+12=0+12 3x^2=12 do you know the next step?
Bananas1234
  • Bananas1234
no, sorry
hockeychick23
  • hockeychick23
no problem, ok so we take 3x^2=12 and divide both sides by 3 3x^2/3=12/3 x^2=4 now we find the square root of x sqrt(x^2)= sqrt(4) x=2

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hockeychick23
  • hockeychick23
do you get how i got x=2?
Bananas1234
  • Bananas1234
i think so, you got the square root of 4?
hockeychick23
  • hockeychick23
correct :) so when dividing 3x^2 by 3 you eliminate the constant (3) and are left with x^2 general rule is what you do to one side of the equation you also need to do to the other which is why i divided 12 by 3. once you divide 12/3 you are left with x^2=4 and by taking the square root we get x=2
Bananas1234
  • Bananas1234
i see
Bananas1234
  • Bananas1234
so whats next?
hockeychick23
  • hockeychick23
finding that x=2 is your last step
Bananas1234
  • Bananas1234
ok
Bananas1234
  • Bananas1234
thank you!
hockeychick23
  • hockeychick23
sure :)

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