Question

Se x+y=8 e xy =l5 o valor de x²+ 6xy+ y²

Answer 1

x²+ 6xy+ y² = x²+2xy+y² + 4xy

x²+ 6xy+ y² = (x+y)² + 4.xy

x²+ 6xy+ y² = (8)² + 4.(15)

x²+ 6xy+ y² = 64 + 60

x²+ 6xy+ y² = 124 ✓

Answer 2

x.y=15

vamos decompor o 15:

x.y=15

15/3
5/5
1

x.y=15
5.3=15

x=5

y=3



x^2+6.(x.y)+y^2=>

(5)^2+6.(15)+(3)^2=>

25+90+9

=>25+99

=>24+100

=>124

espero ter ajudado!

boa tarde!