Question

matrizes determinates
resolva as equações.
a) x x+2 =0
5 7

b) x x=0
5 x

c)x+3 5 =0
1 x-1

Answer 1

Boa noite

a) 

7x - 5*(x + 2) = 0

7x - 5x - 10 = 0 

2x = 10
x = 5 

b) 

x² - 5x = 0
x*(x - 5) = 0

x1 = 0
x2 = 5 

c)

(x + 3)*(x - 1) - 5 = 0 

x² + 2x - 8 = 0

(x + 4)*(x - 2) = 0 

x1 = 2
x2 = -4