Archetype Sub-90 Dry-Wipe Invariant (Surd Rationalisation, Difference-of-Squares & Laws of Indices): Factor out common surds before rationalising; memorise (a + b√(n))(a - b√(n)) = a² - n*b² and convert all base powers (4ˣ, 8ˣ, 9ˣ) to prime bases (2²ˣ, 2³ˣ, 3²ˣ) in Line 1.
sub90 ESATARCH-M1-02: Surd Rationalisation, Difference-of-Squares & Laws of IndicesMathematics 1
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SUB-90 ZONE (<40S)
0.0s40s Sub-9090s ESAT Budget150s Classroom
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Question 1 of 35 • 90s Target
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Mathematics 1•ARCH-M1-02•Standard 5-Option
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