Question

b) 7x²+2=30
C) x²-6x=0
D)4x²-12x=0

Answer 1

B)
7x² + 2 = 30
7x² = 30 - 2
7x² = 28
x² = 28/7
x² = 4
x = √4
x = + 2 e x = - 2

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C)
x² - 6x = 0
x.(x - 6) = 0
x = 0
x - 6 = 0
x = 6

R.: x = 0 e x = 6

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D)
4x² - 12x = 0
x(4x - 12) = 0
x = 0
4x - 12 = 0
4x = 12
x = 12/4
x = 3

R.: x = 0 e x = 3