Question

Resolva estas equações:

a)(x-3)(x-5)=0 C)(2x+4)(5x-10)=0

b)(x+4)(x+7)=0 d)(2x-5)(3x+6)=0

Answer 1

Explicação passo-a-passo:

a) (x - 3).(x - 5) = 0

x - 3 = 0

x = 3

x - 5 = 0

x = 5

S = {3 ; 5}

b) (x + 4).(x + 7) = 0

x + 4 = 0

x = - 4

x + 7 = 0

x = - 7

S = {- 7 ; - 4}

c) (2x + 4).(5x - 10) = 0

2x + 4 = 0

2x = - 4

x = - 4/2

x = - 2

5x - 10 = 0

5x = 10

x = 10/5

x = 2

S = {- 2 ; 2}

d) (2x - 5).(3x + 6) = 0

2x - 5 = 0

2x = 5

x = 5/2

3x + 6 = 0

3x = - 6

x = - 6/3

x = - 2

S = {- 2 ; 5/2}