\frac{1}{81}x^2-\frac{49}{16}

\frac{9}{4}x^2-\frac{9}{25}

25x^2+40x+16

\frac{4}{9}x^2-\frac{28}{33}x+\frac{49}{121}

11x^2+12\sqrt{11}x+36

16x^2-64

5x^2+8\sqrt{5}x+16

16x^2-72x+81

100x^2+100x+25

7x^2-4\sqrt{7}x+4

\frac{1}{100}x^2+\frac{2}{15}x+\frac{4}{9}

100x^2-100

7x^2+6\sqrt{7}x+9

9x^2-48x+64

\frac{81}{25}x^2-\frac{1}{100}

\frac{1}{4}x^2+\frac{2}{3}x+\frac{4}{9}

25x^2+70x+49

\frac{9}{4}x^2-\frac{3}{2}x+\frac{1}{4}

100x^2-49

100x^2-1

\frac{16}{81}x^2-\frac{81}{16}

\frac{1}{81}x^2+\frac{1}{15}x+\frac{9}{100}

x^2+16x+64

\frac{81}{25}x^2-\frac{162}{55}x+\frac{81}{121}

2x^2-12\sqrt{2}x+36