Question

Luas persegi panjang dengan panjang √24 + √8 cm dan lebar √54 - √18 cm adalah... cm²

Answer 1

Verified answer

Persegi Panjang

p = √24 + √8 = √8 (√3 + 1) cm
l = √54 - √18 = √18 (√3 - 1) cm

Luas
= p × l
= √8 (√3 + 1) × √18 (√3 - 1)
= √8 . √18 (√3 + 1)(√3 - 1)
= √144 . (3 - 1)
= 12 × 2
= 24 cm²