Question

12 - Determine as raízes reais das equações incompletas:
a) x2 - 5x = 0
b) - x2 + 12x = 0
c) 5x2+x=0
d) x2 - 9x = 0
e) x2-9=0
f) 25x2-1=0
g) r2- 64 = 0
h) x2 + 16 = 0
i) -7x2 + 28 = 0
j) (x-7)(x-3) + 10x = 30
k) 2x(x + 1) = x(x + 5) + 3(12 - x)​

Answer 1

Resposta:

a) x.(2-5x) = 0

x = 0

x=2-5 = 0

×=5÷2

× = 5/2