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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

Selitys

(a+b√c)(a-b√c) = a^2 - b^2c, and the result given is 1.

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