(square root 5 +3) (square root 5 -3)

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we know that (a+b)(a-b) = a^2 - b^2

hence we can write using above formula

(square root 5 +3) (square root 5 -3) = (square root 5)^2 -(3)^2

or we can write , 5-9 = -4 Answer

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