anonymous
  • anonymous
Solve: if the product of the square is a positive number and 7 is 21, then what is the number?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
product means multiply and is means "equals".... 7x^2 = 21, then solve
anonymous
  • anonymous
dont get it
anonymous
  • anonymous
first divide both sides by 7

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anonymous
  • anonymous
ok so that is...3 and ...?
anonymous
  • anonymous
that gives you x^2 = 3. Then to solve, take the square root of both sides
anonymous
  • anonymous
x = 3 and -3, but the problem said it had to be a positive number, so 3 is the answer
anonymous
  • anonymous
ok thank you
anonymous
  • anonymous
you're welcome

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