Question

write down the following products

Answer 1

Answer:

1)  ( 3b+7) (3b-7)

  = (a+b)    (a-b)    =  a² - b²

  = (3b)² - 7²

  = 9b² - 49.............is the answer

2) [ 1/3-5x ] [ 1/3+5x ]

   = ( a-b ) ( a+b )  = a² - b²

   =  (1/3)² - (5x)²

   = 1/9 - 25x²....................is the answer

3) (x³-3)(x³+3)

=  (x³)² - 3²

= x^6 - 9..........................is the answer

4) (a^4-1/5y) (a^4+1/5y)

 = (a^4)² - (1/5y)^2

 = a^8 - 1/25y²....................is the answer