Question

determine os zeros das funções de variaveis quando existem
f(×)=2×-6, f(×)=3×+12, f(×)=ײ-4×-5​

Answer 1

f(x) = 2x - 6

2x - 6 = 0

2x = 0 + 6

2x = 6

x = 6 / 2

x = 3

f(×)=3×+12

3x+12=0

3x=0-12

3x=-12

x=-12/3

x=4

f(×)=ײ-4×-5​

a=1    b=-4   c=-5

∆=b²-4.a.c

∆=-4²-4(1)(-5)

∆=36

x=-b+- rais de delta/2a

x=4+-6/2

x'=4+6/2

x'=5

x''=4-6/2

x''=-1