Vamos là.
usaremos a fatoração.
a) x² - 11x = 0
x*(x - 11) = 0
x1 = 0
x2 = 11
b) 9x² - 4 = 0
(3x - 2)*(3x + 2) = 0
x1 = 2/3
x2 = -2/3
c) x² - 9x = 0
x*(x - 9) = 0
x2 = 9
d) 4x² - 81 = 0
(2x - 9)*(2x + 9) = 0
x1 = 9/2
x2 = -9/2
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Vamos là.
usaremos a fatoração.
a) x² - 11x = 0
x*(x - 11) = 0
x1 = 0
x2 = 11
b) 9x² - 4 = 0
(3x - 2)*(3x + 2) = 0
x1 = 2/3
x2 = -2/3
c) x² - 9x = 0
x*(x - 9) = 0
x1 = 0
x2 = 9
d) 4x² - 81 = 0
(2x - 9)*(2x + 9) = 0
x1 = 9/2
x2 = -9/2