Question

resolva as equaçoes x^2+25=0

Answer 1

a) x² - 7x = 0
   x ( x -7) = 0
   x1 = 0

   x-7 = 0
   x2 = 7

b) x² + 25 = 0
    x² = -25
    x² = √-25 ∉R

c) x² - 2x = 0
    x(x - 2) = 0
    x1 = 0
    x - 2 = 0
    x2 = 2

d) x² - 64 = 0
    x² = 64
    x = +-√64
    x = +-8
    x1 = 8
    x2 = -8