(1) [[$ 5x^2 +2x -1 < 0 $]]

(2) [[$ 2x^2 +5x -5 < 0 $]]

(3) [[$ x^2 +4x -3 \leq 0 $]]

(4) [[$ -3x^2 +4x +5 < 0 $]]

(5) [[$ x^2 -3x -2 > 0 $]]

(6) [[$ -4x^2 -2x +5 \leq 0 $]]

(1) [[$ -12x^2 -3x -5 \leq -9x^2 -7x -9 $]]

(2) [[$ -7x^2 -10x -13 > -8x^2 -8x -10 $]]

(3) [[$ -7x^2 -9x -13 < -9x^2 -7x -9 $]]

(4) [[$ -5x^2 -3x -10 < -8x^2 -7x -6 $]]

(5) [[$ -7x^2 -9x -13 \geq -9x^2 -7x -9 $]]

(6) [[$ -6x^2 -11x -10 \geq -8x^2 -10x -9 $]]