Problemas aprendiendo a sumar

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2.

a) l x-91 l = 25

R. x -91 = +-25

x = 25 + 91 = 116

x = -25 + 91 = 66

S= {116, 66}

b) l x- 12 l = 82

R. x -12 = +-82

x = 82 +12 = 94

x = -82 + 12 =- 70

S= {94,- 70}

C) ( x + 26 ) 2 = 256

R. x + 26 = +-16

x = 16 - 26 = -10

x = -16 - 26 =- 42

S= {-10, -42}

d) l x – 0.06 l = 0.09

R. x -0.06 = +-0.09

x = 0.09 +0.06 = 0.15

x = -0.09 + 0.06 =- 0.03

S= {0.15, -0.03}

e) l 4x + 2 l = 12

R. 4x + 2 = +-12

x= 12 – 2 / 4 = 2.5

x=-12 -2 / 4 = -3.5

S= {2.5, -3.5}

f) l 9x -5 l = 62

R. 9x – 5 = +-62

x= 62 + 5 / 9 = 7.44

x=-62 + 5 / 9 = -6.33

S= {7.44, -6.33}

g) ) ( x + 5 ) 2 = 121

R. x + 5 = +-11

x = 11 - 5 = 6

x = -11 - 5 =- 16

S= {6, -16}

h) ( x + 2 ) 2 = 16

R. x + 2 = +-4

x = 4 - 2 = 2

x = -4 - 2 =- 6

S= {2, -6}

i) ( x - 0.07 ) 2 = 0.09

R. x - 0.07 = +-0.3

x = 0.3 + 0.07 = 0.37

x = -0.3 + 0.07 =- 0.23

S= {0.37, -023}

J) ( x – 10 ) 2 = 500

R. x – 10 = +-22.36

x =22.36 + 10 = 32.36

x = -22.36 + 10 =- 12.36

S= {32.36,-12.36}