Question

Me ajudem pelo amor de Deus?

Answer 1

Resposta:

Olá boa tarde!

São equações do segundo grau incompletas.

1)

x² - 49 = 0

x² = 49

x = ±√49

x’ = -7 ; x” = +7

S = {-7;+7}

2)

2x² - 50 = 0

2x² = 50

x² = 50/2

x² = 25

x = ±√25

x’ = -5 ; x” = +5

S = {-5;+5}

3)

x² - 1= 0

x² = 1

x = ±√1

x’ = -1 ; x” = +1

S = {-1;+1}  

4)

8x² - 8 = 0

8x² = 8

x² = 8/8

x² = 1

x = ±√1

x’ = -1

x” = 1

S= {-1;+1}

5)

7x² +2 = 30

7x² = 30 – 2

7x² = 28

x² = 28 / 7

x² = 4

x = ±√4

x’ = -2 ; x” = +2

S = {-2;+2}  

6)

3x² +5x = 0

x(3x +5) = 0

x = 0

3x + 5 = 0

3x = -5

x = -5/3

x’ = 0 ; x” = -5/3

S = {0;-5/3}  

7)

x² -5x = 0

x(x -5) = 0

x = 0

x - 5 = 0

x = +5

x’ = 0 ; x” = +5

S = {0;+5}  

8)

4x² - 12x = 0

x(4x -12) = 0

x = 0

4x -12 = 0

4x = 12

x = +3

x’ = 0 ; x” = +3

S = {0;+3}  

9)

7x² + 14x = 0

x(7x +14) = 0

x = 0

7x + 14 = 0

7x = -14

x = -14/7

x = -2

x’ = 0 ; x” = -2

S = {0;-2}

10)

-2x² +10x = 0

x(-2x +10) = 0

x = 0

-2x + 10 = 0

-2x = -10  *(-1)

2x = 10

x = 10/2

x = 5

x’ = 0 ; x” = +5

S = {0;+5}