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= (akar2 × (akar5 - 3))/(5 - 9)
= (akar10 - 3akar2)/-4
= - 1/4 (akar10 - 3akar2)
b) 9/(akar5 - akar2) × (akar5 + akar2)/(akar5 + akar2)
= (9 × (akar5 + akar2))/(5-2)
= (9akar5 + 9akar2)/3
= 9(akar5 + akar2)/3
= 3(akar5 + akar2)