Question

pls help me friends I am having maths exam​

Answer 1

Answer:

7.

${x}^{2} - 2x + 2x - 4 \\ {x}^{2} - 4$

8.

${a}^{0} = 0$

9.

$\frac{ {5}^{3} }{ {5}^{2} } \\ \\ \frac{125}{25} = 5$

11.

$\sqrt{490000} = {700}^{2}$

12.

$3xz - 3 {x}^{2} - 3xy + 3yz - 3 {y}^{2} - 3yx \\ \\ 3xz - 3 {x}^{2} - 6xy + 3yz - 3 {y}^{2}$

13.

$12a - 9ab - 4a +7ab \\ \\ 8a - 2ab$

14.

${x}^{6}$