Question

resolva as equaçoes:
x² - 64 = 0

x² + 3x = 0

x²+2x+1 = 0

Answer 1

x² - 64 = 0
x² = 64
x = +/-\/64
x = +/-8

x²+3x = 0
x.(x+3) = 0
x = 0
x+3 = 0
x = -3

x²+2x+1 = 0
delta = 4 - 4
delta = 0
x' = x" = -b/2a = -2/2 = -1