Question

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

Answer 1

To add unlike denominator you have to make the denominator like , in order to subract them .

• Find the LCM of 7x and 3x

= 21

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

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

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