Question

b) f(x)-x²+9x-8= 10 .

Answer 1

Resposta:

x1= 3

x2= 6

Explicação passo-a-passo:

b) f(x)-x²+9x-8= 10

b) f(x)-x²+9x-8= 10 f(x) -x²+9x-8=10

f(x) -x²+9x-18

-x²+9x-18=0

a= -1; b= 9; c= -18

∆= b²-4ac

∆= 9²-4.(-1).(-18)

∆= 81-72

∆= 9

x= -b±√∆ / 2a

x= -9±√9 / 2.(-1)

x= -9±3 / (-2)

x1= -9+3 / (-2)

x1= -6 / (-2)

x1= 3

x2= -9-3 / (-2)

x2= -12 / (-2)

x2= 6