Question

resolva essas equações no conjunto IR : a) x²-12x=0 b) x²-1=0 c) x²-16=0 d) 5x²-3x=0

Answer 1

a. x²-12x=0
x (x -12) =0
x-12=0

x=12
x=0

Answer 2

x² - 12x = 0

Fator comum :

x(x - 12) = 0

x = 0

x - 12 = 0
x = 12


x² - 1 = 0
x² = 1
x = ± √1 = ± 1


x² - 16 = 0
x² = 16
x = ± √16 = ± 4

5x² - 3x = 0
x(5x - 3) = 0

x = 0

5x - 3 = 0
5x = 3
x = 3/5