Question

2. Resolva as equações colocando o fator comum em evidência. (Coeficiente c = 0)
a) x²–7x=0
b) x²+3x=0
c) x²-14x=0
d) x²-8x=0
e) x²+10x=0
f) 4x²–20x=0
g) 3x²–3x=0
h) 7x²–28x=0
i) 6x²–12x=0
j) 9x²–72x=0

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Answer 1

Resposta:

Explicação passo a passo:

a)x² - 7x = 0

x(x - 7) = 0

x = 0

x - 7 = 0

x = 7

S = {0 ; 7}

b)x² + 3x = 0

x(x + 3) = 0

x = 0

x + 3 = 0

x = -3

S = {0 ; -3}

c)x² - 14x = 0

x(x - 14) = 0

x = 0

x - 14 = 0

x = 14

S = {0 ; 14}

d)x² - 8x = 0

x(x - 8) = 0

x = 0

x - 8 = 0

x = 8

S = {0 ; 8}

e)x² + 10x = 0

x(x + 10) = 0

x = 0

x + 10 = 0

x = -10

S = [0 ; -10}

f)4x² - 20x = 0

4x(x - 5) = 0

4x = 0

x = 0/4

x = 0

x - 5 = 0

x = 5

S = {0 ; 5}

g)3x² - 3x = 0

3x(x - 1) = 0

3x = 0

x = 0/3

x = 0

x - 1 = 0

x = 1

S = {0 ; 1}

h)7x² - 28x = 0

7x(x - 4) = 0

7x = 0

x = 0/7

x = 0

x - 4 = 0

x = 4

S = {0 ; 4}

i)6x² - 12x = 0

6x(x - 2) = 0

6x = 0

x = 0/6

x = 0

x - 2 = 0

x = 2

S = {0 ; 2}

j)9x² - 72x = 0

9x(x - 8) = 0

9x = 0

x = 0/9

x = 0

x - 8 = 0

x = 8

S = {0 ; 8}