Question

(7+3√5) (7 -3√5)
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(3+√5) (3-√5)


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Answer 1

Answer:

>> Using $A^{2}$ - $B^{2}$  = ( A - B ) * ( A  + B )

>>  ( 7^2 - (3√5)^2 ) / ( 3^2 - (√5)^2 )

>> ( 49 - 45 ) / ( 9 - 5 )

>> 4 / 4

>> 1.

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