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Question
Find the product.
`(3 - sqrt(5))(3 + sqrt(5))`
Sum
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Solution
To find the product:
`(3 - sqrt(5))(3 + sqrt(5))`
Use the identity:
(a – b)(a + b) = a2 – b2
Here:
- `a = 3`
- `b = sqrt(5)`
Now apply the identity:
= `3^2 - (sqrt(5))^2`
= 9 – 5
= 4
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