Question

(129-9) (129+9) which identity used​

Answer 1

Answer:

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Step-by-step explanation:

$(x + y)(x - y) = {x}^{2} - y {}^{2}$

use the above identity to solve the questions

the answer should be 16560.

Answer 2

Answer:

(129 -9) ( 129 + 9)

(129)^2 - (9)^2

16,641 - 81

= 16,560

Therefore the required answer is 16,560

Identity used to solve this question is:

( a-b ) ( a+b) = ( a^2-b^2).