Tìm x biết

Tìm x biết:

a. x2-25 –( x+5 ) = 0                                    

b. 3x(x-2) – x+ 2 = 0   

c. x( x – 4)  - 2x + 8 = 0

d. 3x (x + 5) – 3x – 15=0

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e. ( 3x – 1)2 – ( x +5)2=0

f. ( 2x -1)2  – ( x -3)2=0

g.(2x -1)2- (4x2 – 1) = 0                               

g. x2(x2 + 4) – x2 – 4 = 0

i.x4  - x3 +x2 - x  =0

k. 4x2 – 25 –( 2x -5)(2x +7)=0

l.x3 – 8 – (x -2)(x -12) = 0

m.2(x +3) –x2– 3x=0