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Mathematics for IGCSE & O level - Surds (Section 1 - No. 38)
If (a+b√c)(a-b√c)=1, then what is the value of a^2-b^2c?
1
-1
a^2 + b^2c
0
Forklaring
(a+b√c)(a-b√c) = a^2 - b^2c, and the result given is 1.
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