Math, asked by sahii7967, 6 months ago

Multiply the sum of 6 upon 7 and minus 13 upon 21 by their difference

Answers

Answered by IIMidnightHunterII
3

Answer:

  = \frac{6}{7}  +  \frac{ - 13}{21}  \\  \\  =  \frac{6 \times 21 + ( - 13 \times 7)}{21 \times 7 }  \\  \\  =  \frac{126 + ( - 91)}{147}  \\  \\  =  \frac{126 - 91}{147}  \\  \\  =  \frac{35}{147}  =  \frac{5}{21} .....i \\  \\  \\  =  \frac{6}{7}  - ( \frac{ - 13}{21} ) \\  \\  =  \frac{6 \times 21 - ( - 13 \times 7)}{7 \times 21}  \\  \\  =  \frac{126 - ( - 91)}{147}  \\  \\  =   \frac{126 + 91}{147}  \\  \\  =  \frac{225}{147}  =  \frac{75}{49} .......ii \\  \\ multiply \: i \: and \: ii \\  \\  =  \frac{5}{21}  \times  \frac{75}{49}  \\  \\  =  \frac{375}{1029}  =  \frac{125}{343}

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