rationalize 3 minus 2 under root 2 the whole square
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(3-2√2)^2
=3^2+2√2^2-2×3×2√2
=9+8-12√2
=17-12√2
=3^2+2√2^2-2×3×2√2
=9+8-12√2
=17-12√2
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