1.\:\:expand\:(3x^{2}+2y)(5x^{2}+4y)
2.\:\:expand\:(2x^{2}+6y)(4x^{2}-2y)
3.\:\:expand\:(5x^{2}-3y)(2x^{2}+5y)
4.\:\:expand\:(8x^{2}+8y)(3x^{2}+8y)
5.\:\:expand\:(9x^{2}+8y)(8x^{2}-2y)
6.\:\:expand\:(4x^{2}-4y)(7x^{2}+8y)
7.\:\:expand\:(7x^{2}+9y)(4x^{2}+8y)
8.\:\:expand\:(3x^{2}-3y)(2x^{2}+7y)
9.\:\:expand\:(3x^{2}+5y)(2x^{2}+10y)
10.\:\:expand\:(3x^{2}-2y)(7x^{2}+9y)
