9x^2-4=0

2x^2=3x

2=7x^2+2

(2x+1) (x-4) = (x-2) (x+2)

9x^2-4=0

9x^2 = 4 / : 9

x^2 = 4/9

x = ± 2/3

2x^2=3x

2x^2 - 3x = 0

x (2x - 3) = 0

x = 0 либо x = 1,5

2=7x^2+2

7x^2 = 0 / : 7

x^2 = 0

x = 0

(2x+1) (x-4) = (x-2) (x+2)

2x^2-7x - 4 = x^2 - 4

x^2 - 7x = 0

x (x - 7) = 0

x=0 либо x = 7

9 х²-4=0

9 х²=4

х²=4/9

х=±2/3

2 х²=3 х

2 х²-3 х=0

х (2 х-3) = 0

х1=0

х2=1,5

2=7 х²+2

-7 х²=0

х=0

2 х²-8 х+х-4=х²-4

х²-7 х=0

х (х-7) = 0

х1=0

х2=7