Question

Tìm x:

a) x.(x+7)=0

b)(x+12).(x-3)=0

Answer 1

a) x.(x+7) = 0

=> x = -7

b) ( x+12 ) . ( x-3) = 0

 

Answer 2

x=0 va x=-7x = -12 va x = 3

Answer 3

a, x.(x+7)=0

suy ra: x=0 or x+7=0

suy ra:x=0 or x=-7

b,(x+12).(x-3)=0

suy ra : x+12=0 or x-3=0

suy ra : x=-12 or x=3

Answer 4

a,\(x\in\left\{0;-7\right\}\)

b,\(x\in\left\{-12;3\right\}\)