(x2+9).(2x-4)=0
=>x2+9=0 hc 2x-4=0
TH1:x2+9=0=>x=-4,5
TH2:2x-4=0=>x=2
Vậy x = -4,5 hc 2
tick nha !!!
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Các câu hỏi tương tự
a) (x-1).(x+2)=0
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c) (x+4)(-3x+9)=0
d) (2x-4)(x+3)=0
e) (x2-9).(2x+10)=0
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tìm x , y thuộc Z biết :
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b, (x^2 - 9 ). (x +2 )=0
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1)7.(x-1) +2x.(x-1) =0
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1) Tìm x biết :
a) 2x + 5 = x - 7
b) |x| = |8|
c) | 2x - 1 | = | - 13 |
d) 5x + 4 = 3x - 6
e) 4 ( x - 1 ) = 2 ( x + 2 ) = 6
f) x2 - 8x = 0
g) 2x2 + 6x = 0
h) | x + 1 | = 5
i) x + 2 | bé hơn hoặc bằng 4
k) | x - 9 | = x - 9
l) 3x - 5 = 2x + 7
m) 4x - 9 = 3x +5
n) ( 5x - 10 ) ( 6x + 1 ) = 0