Question

resolva as equações do 2 grau
1) x²-16=0
2) 2x²-50=0
3) x²-5x=0
4) 3x²+6x=0
5) x²- 3x + 2=0
6)2x²-14x+24=0​

Answer 1

Resposta:

espero ajudar...

Explicação passo-a-passo:

1) x²-16=0

Δ=0²- 4.1.(-16)

Δ= 0+64 = 64

X= -0 +- √ 64 / 2.1

X= 0 +-8 / 2

X'= 0 +8 /2= 4

X"= 0-8/2 = -4

2) 2x²-50=0

Δ= 0²-4.2.(-50)

Δ= 0 +400=400

X=0 +- √400 / 2.2

X= 0+- 20 / 4

X'= 0+20/4= 5

X"= 0-20/4= -5

3) x²-5x=0

Δ= 5²-4.1.0

Δ= 25-0=25

X= - (-5) +- √25/2.1

X= 5+-5/2

X'= 5+5/2 = 5

X"= 5-5/2 = 0

4) 3x²+6x=0

Δ=6²-4.3.0

Δ= 36-0 = 36

X= -6+-√36/2.3

X= -6+-6/6

X'= -6+6/6= 0

X" = -6-6/6= -2

5) x²- 3x + 2=0

Δ= -(-3²)-4.1.2 = 14

X=-(-3) +-7/2

X'= 5

X" = -2

6)2x²-14x+24=0

Δ= -(-14²) -4.2.24 = 4

X= - (-14) +-2/4

X'=14+2/4 =4

X"= 14-2/4=3