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lisabon 2012 [21]
3 years ago
15

Find the exact solution of 3x^2+7=28

Mathematics
1 answer:
Softa [21]3 years ago
4 0

\text{Solve:}\\\\3x^2+7=28\\\\\text{Subtract 7 from both sides}\\\\3x^2=21\\\\\text{Divide both sides by 3}\\\\x^2=7\\\\\text{Square root both sides}\\\\\sqrt{x^2}=\sqrt7\\\\x=\pm\sqrt7\\\\\boxed{x=\sqrt7\,\,or\,\,x=-\sqrt7}

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