Question

responda as equações da foto

Answer 1

a) 3x²-27=0
9x=0+27
x=27/9
x=3

b) x²-49=0
x²=0+49
7²=49
x=7

c) x²-64/4=0
x²=0+16
4²=16
x=4

d) x²-80=41
x²=41+80
x²=121
11²=121
x=11

Answer 2

2- a) 3x²-27=0                     b) x²-49 =0                      

3x²=27                                  x²=49                                                                                 

x²=27/3                                  x=+ou- √49                                         

x²=9                                       x= +7 e -7

x=+ou-√9                               S={-7, +7}

x=+3 e -3                              c) x²-64/4=0         d) x²-80=41

S={-3, +3}                                 x²=16                    x²=80+41

                                                 x=+ou- √16           x²=121

                                                x=+4 e -4                  x=+ou-√121

                                                S={-4, +4}              x= +11 e -11

                                                                                 S={-11, +11}