Answer:
its A.
Step-by-step explanation:


Multiply complex numbers 5+6i and 5-6i in the same way as you multiply binomials.

By definition, i² is -1.

Do the multiplications.

Now cancel -30i & +30i

Now the equation becomes

________
Hope it helps.
ŕάίήвόώşάĻţ2²2²
Total number of trees n = 4 + 3 + 3 = 10. Count the number of each different trees. n1=4, n2=3, n3=3. Number of ways the landscaper plant the trees in a row is = 10 ! / ( 4! * 3! * 3! ) = 3628800 / ( 24 * 6 * 6 ) = 3628800 / 864 = 4200 ways.
Therefore, the trees can be planted 4200 ways
-9
There are the same signs so you'd just add them together and use whatever sign they are..