Question

Using a2 - b2=(a+b) (a-b),find 23.1sq - 6.9sq​

Answer 1

Answer:

(23.1)^2 - (6.9)^2 = 486

Step-by-step explanation:

( 23.1 )^2 - ( 6.9 )^2

= ( 23.1 + 6.9 ) ( 23.1 - 6.9 )

{ •°• a^2 - b^2 = (a+b) (a-b) }

= 30*16.2

= 486

Answer 2

Answer:

${(23.1)}^{2} - {(6.9)}^{2} \\ (23.1 + 6.9)(23.1 - 6.9) \\ 30(16.2) \\ 486$