Question

factorise 81/x square - 25 y square/ 9​

Answer 1

Answer:

$\frac{81}{x^{2} } - \frac{25y^2}{9}= (\frac{9}{x} - \frac{5y}{3} )(\frac{9}{x} + \frac{5y}{3} )$

Step-by-step explanation:

$\frac{81}{x^{2} } - \frac{25y^2}{9} = (\frac{9}{x} )^2 - (\frac{5y}{3})^2$

Using a² - b² = (a - b)(a + b)

$(\frac{9}{x} )^2 - (\frac{5y}{3})^2 = (\frac{9}{x} - \frac{5y}{3} )(\frac{9}{x} + \frac{5y}{3} )$

Answer 2

Step-by-step explanation:

hope it will help you bro