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= 3(7+V2) + 4(7-V2)
= 21 + 3V2 + 28 - 4V2
= 49 - V2
b) 2ab
= 2(7+V2)(7-V2)
= 2(49 - 2)
= 94
c) (a+b)^2
= (7+V2+7-V2)^2
= 14^2
= 196
d) a^2 - b^2
= (a + b)(a - b)
= (7+V2+7-V2)(7+V2-(7-V2))
= 14 (2V2)
= 28 V2
2.) Luas persgi panjang
= panjang x lebar
= (5V3 - V2)(2V3 + V2)
= 30 + 5V6 - 2V6 - 2
= 28 + 3V6
Soal No.8