Question

Toling dijawab no 18 yaa, dengan caranyaa.. terimakasih

Answer 1

Verified answer

Kelas 9 Matematika
Bab Akar dan Pangkat

^ = pangkat

x² + y² = (x + y)² - 2xy
2 = 1² - 2xy
2xy = 1 - 2
xy = -1/2

(x² + y²)² = x^4 + 2x²y² + y^4
2² = (x^4 + y^4) + 2 (xy)²
x^4 + y^4 = 4 - 2 . (-1/2)²
x^4 + y^4 = 4 - 2 . 1/4
x^4 + y^4 = 3 1/2