tolong dibantu pertanyaan saya...

d.(12-2√5)²
(a-b)²=a²-2ab+b²
=(12)²-2(12)(2√5)+(2√5)²
=144-48√5+20
=164-48√8
e.(6-2√5)(6+2√5)
(a-b)(a+b)=a²-b²
=6²-(2√5)²
=36-20=16
f.(24√2+3√3)(24√2-3√3)
=sama seperti e
(24√2)²-(3√3)²
=1152-27=1125

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