Question

ME AJUDEM NESSES EXERCICIOS POR FAVOR?

Answer 1

Resposta:

Explicação passo-a-passo:

1

A)4x2-5x=0

X(4x-5)=0-->4x-5=0-->x=5/4

B)X2/4+2x/5=0--->5x2+8x/20=0

X(5x+8)=0--->5x+8=0---->x=-8/5

2

A)9x2-16=0-->X2=16/9-->x=4/3

B)4x2-25=0--->X2=25/4-->x=5/2

3

A)2x2+7x+3=0

∆=49-4×2×3=49-24=25

X1=-7+5/2×2--->-2/4--->-1/2

X2=-7-5/4--->-12/4--->-3

B)x2-9x+12=0

∆=81-48=33

X1=9+√33/2

X2=9-√33/2