(√2-3√7) (√2+3√7)= (√2)² -(3√7)² = 2 -63= -61
(√2-3√7)(√2+3√7)= ( - (3 = 2-63 = -61
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(√2-3√7) (√2+3√7)= (√2)² -(3√7)² = 2 -63= -61
(√2-3√7)(√2+3√7)= ( - (3 = 2-63 = -61