Adding & Subtracting Polynomials Test Prep AK

1. C

$\eqalign{(8+3i)+(9-7i)\\8+3i+9-7i\\17-4i}$

2. C

$\eqalign{(4-2i)-(6-5i)\\4-2i-6+5i\\-2+3i}$

3. D

$\eqalign{(y^2+xy+5xy^2)-(xy-5xy^2-y^2)\\y^2+xy+5xy^2-xy+5xy^2+y^2\\2y^2+10xy}$

4. C

$\eqalign{(3xy^2-x^2y+3y^2)-(-6xy^2+5x^2y-y^2)\\3x^$y-x^2y+3y^2+6xy^2-5x^2y+y^2\\9x^2y-6x^2y+4y^2}$