Question

y elevado a 2-6y+9=16

Answer 1

y² - 6y + 9 = 16
y² - 6y + 9 - 16 = 0
y² - 6y - 7 = 0

delta = b² - 4.a.c

a= 1
b= -6
c= -7


delta = (-6)² - 4.1.(-7)
delta = 36 + 28
delta = 64

x = -b ± √delta/2.a

x = -(-6) ± √64/2.1

x = 6 ± 8/2

x = 6 - 8/2 = -2/2 = -1

x = 6 + 8/2 = 14/2 = 7


s={ -1, 7 }