Question

1) 1 (2x+1)(2x- 1) + 20x;
Б) у (у+6) < (y+3)2 ;
B) (x +5)(x - 8) > x(x + 7) - 32;

Answer 1

1)4x^2 + 20 х = 0

х ( 4 х+20) =0

х=0 или x=-5

2) у^ 2 + 6 у <2 у +6

y^2+6y-2y-6<0

y^2+4y<6

y(y+4)<6

y<6 y<2

3)x^2-8x+5x-40>x^2+7x-32

-8x+5x-40-7x+32>0

-10x-12>0

-10x>12 |÷-10

x<-1,2