Question

a 5x2-7x-3=0 b x2-4x+2=0 c x2-x-1=0 d 2x2+7x+8=0 qual e as respostas das perguntas

Answer 1

Resposta:

A) 5X2 - 7X - 3 = 0

2X2 = 7 + 3 + 0 - 5

2X2= 5

X2 = 5/2

B) X2 - 4X + 2 = 0

2X2 = 4 - 2 + 0

2X2 = 2

X2 = 2/2

X2 = 1

C) X2 - X - 1 = 0

-2X2 = 1

X2 = 1/ - 2

X2 = 2/1

D) 2X2 + 7X + 8 = 0

3X2 = - 7 - 8

3X2 = - 15

X2= - 15 / 3

X2 = -5