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maka: (√2 - 1)²/(2 - 1) = 3 - 2√2
2f) kalikan sekawan dengan (3√2 + 4)/(3√2 + 4)
maka: (4√3 - 1)(3√2 + 4)/(18 - 16) = (12√6 + 16√3 - 3√2 - 4)/2
2g) kalikan sekawan dengan (2√7 + 1)/(2√7 + 1)
maka: (2 - 4√7)(2√7 + 1)/(28 - 1) = (4√7 + 2 - 56 - 4√7)/27
= -54/27
= -2
√2 + 1 (√2 + 1)(√2 - 1) 2 - 1
2f) 4(√3 - 1) = 4(√3 - 1)(3√2 + 4) = 4(3√6+4√3-3√2-4) = 2(3√6+4√3-3√2-4) atau
3√2 - 4 (3√2 - 4)(3√2 + 4) 18 - 16 = 6√6+8√3-6√2-8
2g) 2 - 4√7 = (2 - 4√7)(2√7 + 1) = 4√7 + 2 - 56 - 4√7 = - 54 = - 2
2√7 - 1 (2√7 - 1)(2√7 + 1) 28 - 1 27