Question

sabe-se que xy=48 e x²+y²=100. Então qual o valor de (x+y)?

Answer 1

x²+y²=100

xy=48  ==>2xy=96

x²+y²=100

x²+2xy+y² = 100+96

(x+y)²=196

x+y=14

Answer 2

Boa tarde

xy = 48
x² + y² = 100

(x + y)² = x² + y² + 2xy = 100 + 96 = 196 

x + y = √196 = 14 
x + y = -√196 = -14