8 + 3 under root 2 to multiply 8 minus 3 under root 2
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Step-by-step explanation:
(8 +3√2) × (8 - 3√2)
= 8 × 8 - 8 × 3√2 + 3√2 × 8 - 3√2 × 3√2
= 64 - 24√2 + 24√2 - 18
=64 - 18
= 46
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