3) (2√7 + 3)² = 28+12√7+9 = 37 + 12√7
4) (7√2 - 3√3)(7√2 + 3√3) = (98 - 27) - (98+27) = -54
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3) (2√7 + 3)² = 28+12√7+9 = 37 + 12√7
4) (7√2 - 3√3)(7√2 + 3√3) = (98 - 27) - (98+27) = -54