Question

x ao quadrado menos 10x + 8 = -1​

Answer 1

Bom dia!

x²-10x +8 = -1

x² -10x +8+1= 0

x²-10x+9=0

a= 1

b= -10

c= 9

∆ = b²-4.a.c

∆ = (10)² -4.a.9

∆ = 10 - 36

∆=64

x = -b±√∆/2.a

x = -(-10)±√64/2

x' = 10+8/2

x' = 9

x" = 10-8/2

x" = 1

S= {1,9}

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