1.
15x^{4}+22x^{2}y+8y^{2}
2.
8x^{4}+20x^{2}y-12y^{2}
3.
10x^{4}+19x^{2}y-15y^{2}
4.
24x^{4}+88x^{2}y+64y^{2}
5.
72x^{4}+46x^{2}y-16y^{2}
6.
28x^{4}+4x^{2}y-32y^{2}
7.
28x^{4}+92x^{2}y+72y^{2}
8.
6x^{4}+15x^{2}y-21y^{2}
9.
6x^{4}+40x^{2}y+50y^{2}
10.
21x^{4}+13x^{2}y-18y^{2}
