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  • 25-07-2017
  • Mathematics
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which rational number must be added to3\7to get -3\4 ?

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Apocrophon
Apocrophon Apocrophon
  • 25-07-2017
[tex]\frac{3}{7}+x=-\frac{3}{4}\\\\\frac{3}{7}(\frac{4}{4})+x=-\frac{3}{4}(\frac{7}{7})\\\\\frac{12}{28}+x=-\frac{21}{28}\\\\x=-\frac{21}{28}-\frac{12}{28}\\\\x=-\frac{33}{28}=1\ \frac{5}{28}[/tex]
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