Question

alguém sabe aí

1) x²+8×-65=0

2) 2x²-10x+12=0

3) x²-12+36=0

4) -x²+2x-1=0

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Answer 1

Resposta:

1) a= 1, b= 8; c= -65

Delta

8²- 4.1.(-65) = 64 + 260 = 324

X = -8 +- raiz de 324 / 2.1

X1 = -8 + 18 / 2 = 10/2 = 5

X2 = - 8 - 18 / 2 = -26/2 = -13

2) a=2, b=-10, c=12

Delta

(-10)² - 4.2.12 = 100 - 96 = 4

X= 10 +- 2 / 4

X1= 12/4 = 3

X2= 8/4 = 2

c) a=1, b=-12, c=36

Delta

(-12)² - 4.1.36 = 144 - 144 = 0

X= 12/2 = 6

d)a=-1, b=2, c= -1

Delta

(2)²-4.(-1).(-1) = 4 - 4 = 0

X= -2/-2 = 1

Answer 2

Vamos lá.

1)

x² + 8x - 65 = 0

(x + 13)*(x - 5) = 0

x1 = -13, x2 = 5

2)

x² - 5x + 6 = 0

(x - 2)*(x - 3) = 0

x1 = 2, x2 = 3

3)

x² - 12x + 36 = 0

(x - 6)² = 0

x = 6

4)

x² - 2x + 1 = 0

(x - 1)² = 0

x = 1