Chap 14 DIRECT AND INVERSE PROPORTIONS

Chap 14

DIRECT AND INVERSE PROPORTIONS

SOME IMPORTANT FACTS

1.      When an expression is the product of two or more expressions, then each of these expressions is called a factor of the given expression and the process of writing a given expression as the product of factors is called factorization.

2.      If the given expression is the difference of two squares, then factorization  can be done by using formula ;      a² – b²  = ( a + b )( a – b )

3.      If the given expression is a complete square, then factorization  can be done by using formula;

i)                    a² + 2ab +  b²  =  ( a + b )²  =  (a + b ) ( a – b )

ii)                  a² - 2ab +  b²    =  ( a - b )²  =  (a - b ) ( a – b )