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(2√3 + 3√7)²
= (2√3 + 3√7)(2√3 + 3√7)
misal √3 = x dan √7 = y
= (2x + 3y)(2x + 3y)
= 4x² + 6xy + 6xy + 9y²
= 4x² + 12xy + 9y²
= 4(√3)² + 12(√3×√7) + 9(√7)²
= 4(3) + 12(√21) + 9(7)
= 12 + 12√21 + 63
= 75 + 12√21
=12 + 6 + 6 + 63
=75 + 12