Question

resolva as funções abaixo
a) f(x) =4x²+5x+1
b) y= X²-6x+5​

Answer 1

Explicação passo-a-passo:

4x²+5x+1=0

a=4

b=5

c=1

∆=b²-4ac

∆=5²-4*4*1

∆=25-16

∆=9

-b±√∆/2a

-5±√9/2*4

-5±3/8

x¹=-5+3/8=-2/8(÷2)=>-1/4

x²=-5-3/8=-8/8=>-1

x²-6x+5=0

a=1

b=-6

c=5

∆=b²-4ac

∆=(-6)²-4*1*5

∆=36-20

∆=16

-b±√∆/2a

6±√16/2*1

6±4/2

x¹=6+4/2=10/2=>5

x²=6-4/2=2/2=>1