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Bananas1234

  • one year ago

Solve for x. 3x2 – 12 = 0

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  1. hockeychick23
    • one year ago
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    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?

  2. Bananas1234
    • one year ago
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    no, sorry

  3. hockeychick23
    • one year ago
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    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

  4. hockeychick23
    • one year ago
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    do you get how i got x=2?

  5. Bananas1234
    • one year ago
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    i think so, you got the square root of 4?

  6. hockeychick23
    • one year ago
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    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

  7. Bananas1234
    • one year ago
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    i see

  8. Bananas1234
    • one year ago
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    so whats next?

  9. hockeychick23
    • one year ago
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    finding that x=2 is your last step

  10. Bananas1234
    • one year ago
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    ok

  11. Bananas1234
    • one year ago
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    thank you!

  12. hockeychick23
    • one year ago
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    sure :)

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