Respuesta :

itsmewilliam2110

Answer:

7

Step-by-step explanation:

First use the (a-b) and (a+b) = a^2 - b^2 which is equal to 25 - 9 x 2

then you multiply 9 x 2 which is 18 so 25 - 18 thus 7. The trick is to remember the rules.

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