(√2+√5) (√2+√5)=? Mohon bantuannya kakak

(akar 2 + akar 5) ( akar 2 + akar 5)
= akar 2 (akar 2 + akar 5) + akar 5 (akar 2 +akar5)
= akar (2×2) + akar (2×5) + akar (5×2) + akar (5×5)
= akar 4 + akar 10 + akar 10 + akar 25
= 2 + 2 akar 10 + 5
= 7 + 2 akar 10