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Rezolvați ecuațiile:
b) (x-1)(x+2)=0
c) (x-3)(x+4)=0
d) (x+1)(x-6)=0
e) (x+3)(x-2)=0
f) (2x-1)(2x+3)=0
g) (2x+5)(5x+2)=0
h) (3x-8)(2x+9)=0
i) (4x+3)(7x-2)=0


Răspuns :

Răspuns:

Explicație pas cu pas:

b) (x-1)(x+2)=0

x-1=0  =>  x = 1

x+2=0   =>  x = -2

c) (x-3)(x+4)=0

x-3=0   =>   x = 3

x+4=0   =>  x = - 4

d) (x+1)(x-6)=0

x+1 = 0   =>     x = - 1

x-6 = 0   => x = 6

e) (x+3)(x-2)=0

x+3 = 0   =>   x =-3

x-2= 0    =>    x = 2

f) (2x-1)(2x+3)=0

2x-1=0     =>   x = 1/2

2x+3=0    =>   2x = - 3      =>    x = -3/2

g) (2x+5)(5x+2)=0

2x+5 = 0   => 2x=- 5   =>     x = - 5/2

5x+2 = 0   =>   5x = -2   =>   x =-2/5

h) (3x-8)(2x+9)=0

3x-8 = 0      =>   3x = 8     => x = 8/3

2x+9 = 0    =>    2x =- 9     =>    x = -9/2

i) (4x+3)(7x-2)=0

4x+3 = 0   =>    4x = - 3     => x = -3/4

7x-2 = 0   =>      7x = 2    =>    x = 2/7