Question

Equação de 2° grau ._.​

Answer 1

Resposta:

Explicação passo-a-passo:

1) x²-4=0

x²=4

x=$\sqrt{4}$

x=2

2) 3x²-27=0

3x²= 27

3x²/3=27/3

x²=9

x=$\sqrt{9}$

x=3

3)2x²+20=0

2x²= -20

2x²/2=-20/2

x²=-10

x=$\sqrt{-10}$ ∉ R

4)28Y²-7=0

28Y²=7

28Y²/28=7/28

Y²=0,25

Y=$\sqrt{0,25}$

Y=0,5

5)(2X+1)²=4X+2

2X²+1=4X+2

2X²-4X+1-2=0

2X²-4X-1

Δ=B²-4AC

Δ=(-4)²-4.2.1

Δ=16-8

Δ=8

X=-B±$\sqrt{}$Δ / 2a

x=4±$\sqrt{8}$/2.2

x=4+2.8/4

x=6.8/4

x=1.7

x=4-2.8/4

x=1.2/4

x=0.3