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a^2 - b^2

Step-by-step explanation:

a ( a - b ) + b ( a - b (

= a^2 - ab + ba - b^2

= a^2 - ab + ab - b^2

= a^2 + 0 - b^2

= a^2 - b^2

it is probably the graph on the bottom right.

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490