Question

Решите уравнения! 1) x(x+-3)(x+3)=13 2) 4x(x-+5)(2x-5)=1 3) (x-3)(x+4)-2(3x-2)= 4) 5(x-3)-2(x-7)=7-7(2x+6) 5) 5(8x-1)-7(4x+1)=9-8(7-4x)

Answer 1

1)$x^{2}+2x-x^{2}+9=13$; x=2

2)$4x^{2} - 4x -4x^{2}+25=1$; x= 6

3)$x^{2}-4x-3x+12 -6x+4= x^{2} -8x+16$

-13x+16=16-8x

-13x+8x=0

-5x=0

x=0

4)5х-15-2х+14=7-14х-42;

17x=-34;

x=-2

5)40x-5-28x-7=9-56+32x;

-20x=-35;

x= 1,75

Answer 2

1) x(x+2)-(x-3)(x+3)=13

x^2+2x-x^2+9-13=0

2x-4=0

x=4/2

x=2

2) 4x(x-1)-(2x+5)(2x-5)=1

4x^2-4x-4x^2+25-1=0

-4x+24=0

x=24/4

x=6

3) (x-3)(x+4)-2(3x-2)=
Не дописали уравнение.
 

4) 5(x-3)-2(x-7)=7-7(2x+6)

5x-15-2x+14-7+7*(2x+6)=0

3x-8+14x+42=0

17x+34=0

x=-34/17

x=-2

5) 5(8x-1)-7(4x+1)=9-8(7-4x)

40x-5-28x-7-9+8*(7-4x)=0

12x-21+56-32x=0

-20x+35=0

x=35/20

x=1.75