Question

sabe se que ×2+y2=20 e ×y=3
qual e o valor de ×+y)2?​

Answer 1

(x+y)² = x²+y² + 2.xy

(x+y)² = 20 + 2.3

(x+y)² = 20 + 6

(x+y)² = 26 ✓