Question

(1) resolva as equações de 2 grau.

9) x2 - 49 = 0

14) x2 - 7x = 0

10) x2 = 1 {R: +1 -1}

15) x2 + 5x = 0

11) 2x2 - 50 = 0

16) x2 + x (x - 6) = 0

12) 7x - 7=0

17) x(x + 3) = 5x

13) 5x + 20 = 0

18) x(x-3) -2 (x-3) = 6

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Answer 1

Resposta:

9) x1= 7, x2 = -7

10) x1 = -1, x2 = 1  

11) x1 = -5, x2 = 5  

12) x = 7

13) x = -4  

14)  x1 = 0, x2 = 7  

15) x1 = -5, x2 = 0

16) x1= 0, x2= 3

17) x1= 0 , x2= 2

18) x1= 0, x2 = 5

Explicação passo a passo: