Question

a) x ( x + 0 ) = 0

b) ( x - 1 ) ( 7 - x ) = 0

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

d) ( x + 5 ) + ( x - 9 ) = 13

e) ( 4 + x ) + ( x - 7 ) = x + 2

f) ( 3x + 5 ) - ( 2x - 7) = 4 - x

g) ( x - 1 )² = 36

h) ( 3 - x ) ³ = -27

Answer 1

a) x ( x + 0 ) = 0

x . x = 0

=> x =0

Answer 2

b) ( x - 1 ) ( 7 - x ) = 0

=> x - 1 =0 hoặc 7 - x = 0

TH1 : x - 1 = 0

x = 0 + 1

x = 1

TH2 : 7 - x = 0

x = 7 - 0

x = 7

Vậy x = 1 hoặc x = 7

Answer 3

a: =>x^2=0

=>x=0

b:=>x+1=0 hoặc 7-x=0

=>x=-1 hoặc x=7

c: =>(x-5)(x-3)=0

=>x=5 hoặc x=3

d: =>x+5+x-9=13

=>2x-4=13

=>2x=17

=>x=17/2

e: =>x+4+x-7=x+2

=>x-3=2

=>x=5

f: =>3x+5-2x+7=4-x

=>x+12=4-x

=>2x=-8

=>x=-4

g: =>x-1=6 hoặc x-1=-6

=>x=7 hoặc x=-5

h:=>3-x=-3

=>x=6