Question

Rozwiąż równania.

1. 3x(kwadrat) + 6 = 3x (x-2)

2. ( x + 2 )(2 + x) = x ( x +1 ) + 2

3. ( 3a - 7 )a + 5 = a(kwadrat) + 2a ( a - 1 )

4. -( x -3 ) ( 2x + 1 ) = -2( 6 + x(kwadrat) )

Answer 1

1.

3x²+6=3x²-6x

6=-6x

-x=1

x=-1

2.

2x+x²+4+2x=x²+x+2

4x+x²+4=x²+x+2

3x+2=0

3x=-2

x=-2/3

3. 

3a²-7a+5=a²+2a²-2a

3a²-7a+5=3a²-2a

5-5a=0

-5a=-5

a=1

4.

(-x+3)(2x+1)=-12-2x²

-2x²-x+6x+3=-12-2x²

5x+3=-12

5x=-15

x=-3