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Hasil Dari :
a. (2 + 2 √3) (2 + 2 √ 3)
= (2(1+√3))^2
= 2^2(1+√3)^2
= 4(1+√3)^2
b. (5 - √2) (5 + √2)
= 5-5√2+√2
= 5+(-5√2+√2)
= 5-4√2
c. (3√5 + √3) (3√5 - √3)
= 3√5+3√3x5 -√3
= 3√5+3√15-√3
Terima kasih