Question

Determine as raizes das equações.

a) x² = 81
b) x² = 100
c) (x - 7)² = 0
d) (x + 5)² = 0

Answer 1

a) x² = 81 => x=√81 => x=±9

b) x² = 100 => x=√100 => x = ±10

c) (x - 7)² = 0 => (x-7)=0 => x=7

d) (x + 5)² = 0=> (x+5)=0 => x= -5