Question

Considerando X e R, resolva as equações:

(x-4)^2=81

(x+1)^2=100

(4x+2)^2=36

(3x-9)^2=36

(x+5)^2=1

(x+5)^2=-1

Answer 1

(x-4)^2=81 ==> x - 4 = 9 ==> x = 4+9 ==> 13

(x+1)^2=100 ==> x + 1 = 10 ==> x = 10-1 ==> 9

(4x+2)^2=36 ==> 4x + 2 = 6 ==> 4x = 6-2 ==> 4x = 4 ==> 1

(3x-9)^2=36 ==> x - 9 = 6 ==> x = 6+9 ==> x = 15

(x+5)^2=1 ==> x + 5 = 1 ==> x = 1-5 ==> x = - 4

(x+5)^2= - 1   raiz imaginária.