1) a^4 + 17a^2 + 16 = (a^2 + 16)(a^2 + 1)2) x^2 + y^2 - 10x + 14y + 74 = (x^2 - 10x + 25) + (y^2 + 14y + 49) - 0 = (x - 5)^2 + (y + 7)^23) 2x^2 - 6xy + 9y^2 - 6x + 9 = (x - 3y)^2 + 3(1 - 3y)4) x^2 - y^2 - 4x - 2y + 3 = (x^2 - 4x + 4) - (y^2 + 2y + 1) + 0 = (x - 2)^2 - (y + 1)^2
1) a^4 + 17a^2 + 16 = (a^2 + 16)(a^2 + 1)
2) x^2 + y^2 - 10x + 14y + 74 = (x^2 - 10x + 25) + (y^2 + 14y + 49) - 0 = (x - 5)^2 + (y + 7)^2
3) 2x^2 - 6xy + 9y^2 - 6x + 9 = (x - 3y)^2 + 3(1 - 3y)
4) x^2 - y^2 - 4x - 2y + 3 = (x^2 - 4x + 4) - (y^2 + 2y + 1) + 0 = (x - 2)^2 - (y + 1)^2