Question

alguém me ajudaa? é urgente!

Answer 1

a) x2 - 25= 0
x2= 25
x= +/- √25

x1= 25
x2= -25

b)-25 +100x2 =0
100x2= 25
x2 = 25/100
x= √ 25/100
x= +/- 5/10
x= +/- 1/2

x1= 1/2
x2= - 1/2


c) x2 - 81/4 = 0
x2 = 81/4
x = +/-√81/4

x1 = √81/4
x2= - √81/4

Answer 2

A-
x^2-25=0
x^2=25
x=+-5
S={-5,5}

B-100.x^2-25=0
100.x^2=25
x^2=25/100
x=+-1/2
S={-1/2 ; 1/2}

C-
x^2-81/4=0
x^2=81/4
x=+-9/2
S={-9/2 ; 9/2}