Question

Resolva as equações :

a) ( 3x + 5 )^2 = 36

b) ( -2x + 1 )^2 = 49

c) ( 3 - 2x )^2 = 36

d) ( x/2 - 10 )^2 = 100

Answer 1

a) ( 3x + 5 )^2 = 36
(3x+5) . (3x+5)=36
9x^2+15x+15x+25=36
9x^2+30x-11

b) ( -2x + 1 )^2 = 49
(-2x+1).(-2x+1)=49
4x^2-2x-2x+1=49
4x^2-4x-48

c) ( 3 - 2x )^2 = 36
(3-2x).(3-2x)=36
9-6x-6x+4x^2=36
4x^2-12x-27

d) ( x/2 - 10 )^2 = 100
( x/2-10).(x/2-10)=100
(x^2-40x+400)/4=100
0,25x^2-10x