Question

simplify the following expression (3a+8b) (3a-8b) + (8a-3b) (8a+3b)​

Answer 1

Answer:

(3a)^2-(8b)^2+(8a)^2-(3b)^2

=9a^2-64b^2+64a^2- 9b^2

=73a^2-73b^2

Answer 2

Step-by-step explanation:

= [ 3a ( 3a - 8b ) + 8b ( 3a - 8b ) ] + 8a ( 8a + 3b ) - 3b ( 8a + 3b )

= 9a² - 24ab + 24ab - 64b² + 64a² + 24ab - 24ab - 9b²

= 9a² - 64b² + 64a² - 9b²

[ just to explain : ( 9a² + 64a² ) - 64b² - 9b² ]

= 73a² - 73b² ( Ans )

[ THE UNDERLINED TERMS ARE SUBTRACTED ]