Question

calcule as Equações de 2° Grau.
1) x2 - 8x + 12 = 0
2) x2 - 5x + 6 = 0
3) x2 + 2x - 8 = 0
4) 2x2 - 8x + 6 = 0
5) x2 + 3x - 6 = -8
6) x2 - 7x + 12 = 0
7) x2 - 4x + 3 = 0
8) x2 + x - 2 = 0
9) x2 - 7x + 1 = 9
10) x2 + 5x - 6 = -10
11) x2 - 8x + 11 = -1
12) x2 - 5x + 5 = -1
13) x2 + 2x - 2 = 6
14) x2 - 8x + 3 = -9
15) x2 + 3x - 5 = 5
16) 3x2 + 5x = -X-5+ 2 x2
17) 4x2 - x - 8 = x + 3x2​

Answer 1

Resposta:

Vou resolver as mais interessante

1) x² - 8x + 12 = 0

/\ = (-8)² - 4 . 1 . 12

/\ = 64 - 48

/\ = 16

x = 8 +- v16/2.1

x¹ = 8 + 4/2 => 6

x² = 8 - 4/2 => 2

5) x² + 3x - 6 = -8

x² + 3x + 2 = 0

/\ = 3² - 4 . 1 . 2

/\ = 9 - 8

/\ = 1

x¹ = -3 + 1 /2 => -1

x² = -3 - 1 /2 => -2

10) x² + 5x - 6 = -10

x² + 5x + 4 = 0

/\ = 5² - 4 . 1 . 4

/\ = 25 - 16

/\ = 9

x¹ = -5 + 3 /2 => -1

x² = -5 - 3 /2 => -4

16) 3x² + 5x = -x - 5 + 2x²

3x² - 2x² + 5x + x + 5 = 0

x² + 6x + 5 = 0

/\ = 6² - 4 . 1 . 5

/\ = 36 - 20

/\ = 16

x¹ = -5 + 4 /2 => -1/2

x² = -5 - 4 /2 => -9/2