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Tasya [4]
3 years ago
14

I need help with this? Topic is (ADDING AND SUBTRACTING RATIONAL EXPRESSIONS W/UNLIKE DENOMINATORS)

Mathematics
1 answer:
Tanzania [10]3 years ago
4 0

<u>To</u><u> </u><u>add</u><u> </u><u>unlike</u><u> </u><u>denom</u><u>inator</u><u> </u><u>you</u><u> </u><u>have</u><u> </u><u>to</u><u> </u><u>make</u><u> </u><u>the</u><u> </u><u>deno</u><u>minator</u><u> </u><u>like</u><u> </u><u>,</u><u> </u><u>in</u><u> </u><u>order</u><u> </u><u>to</u><u> </u><u>subr</u><u>act</u><u> </u><u>them</u><u> </u><u>.</u>

  • Find the LCM of 7x and 3x

= 21

  • Multiply both denominator so that there LCM comes as 21 , and multiply same number with numerator .

-  \frac{4 \red{ \times 3}}{7x \red{ \times 3}}  -  \frac{5 \red{ \times 7}}{3x \red{ \times 7}}  \\  \\  \implies \: (making \: denominator \: common) \\  \\   \frac{- 12 - 35}{21x }

\boxed {\purple{ans =  \frac{23}{21x} }}

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Basically you want to find out what is 70% of 80.

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the first fraction would be the percent (70) over 100. (you always use 100)

The fraction to the left would be n over 80. the denominator (the number on the bottom) would be the whole amount. n would be the unknown number

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