section+9.5+-+difference+of+squares


 * Section 9.5- Difference of Squares **

__review:__ multiply- ( 2x + 7 )( 2x - 7 ) = 4x^2-49

__** Difference of Squares **__ a^2-b^2=(a-b)(a+b)

a^2+b^2= PRIME

EX : __factor__: 9p^2-25 ( 3p + **5** )( 3p - **5** )

EX2 : 16x^2-121y^2 ( 4x - 11y )( 4x + 11y )

EX3 : 8p^2-98pq^2 2p(4p^2-49q^2) 2p(2p-7q)(2p+7q)

EX4 : x^2+9 PRIME

EX5 : 196m^4-289n^10 (14m^2-17n^5)(14m^2+17n^5)