\frac{16}{25}x^2-\frac{1}{9}

\frac{9}{25}x^2-\frac{4}{15}x+\frac{4}{81}

\frac{36}{25}x^2-\frac{8}{15}x+\frac{4}{81}

25x^2-100x+100

2x^2-18\sqrt{2}x+81

9x^2-4

10x^2+6\sqrt{10}x+9

10x^2-12\sqrt{10}x+36

81x^2+18x+1

x^2+12x+36

\frac{4}{9}x^2-\frac{1}{121}

\frac{81}{25}x^2-\frac{54}{55}x+\frac{9}{121}

2x^2-18\sqrt{2}x+81

4x^2-4

81x^2+126x+49

\frac{16}{81}x^2+\frac{28}{9}x+\frac{49}{4}

\frac{49}{4}x^2-\frac{1}{25}

81x^2-1

16x^2-56x+49

4x^2+16x+16

10x^2-16\sqrt{10}x+64

\frac{4}{25}x^2+\frac{12}{55}x+\frac{9}{121}

\frac{81}{25}x^2-\frac{49}{81}

\frac{1}{100}x^2+\frac{4}{25}x+\frac{16}{25}

4x^2-81