13. 4 3i5 6i

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13. (4 3i)(5 6i) 4(5) 4(6i) 3i(5)
3i(6i) foil method 20 24i 15i 18i2
20 39i 18(-1) 20 39i 18 2 39i
41. (10i)6 106 i6
1,000,000 i2 i2 i2
1,000,000(-1)(-1)(-1) -1,000,000
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15. (6 5i)(-3 i) 6(-3) 6i 5i(-3)
5i(i) foil method -18 6i 15i 5i2 -18
21i 5(-1) -18 21i 5 -13 21i
17. (4 5i)2 (4 5i)(4 5i) 4(4) 4(5i)
5i(4) 5i(5i) foil method 16 20i 20i
25i2 16 40i 25(-1) 16 40i 25 -9
40i
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21. (-5 i)2 (-5 i)(-5 i) -5(-5)
5(-i) i(-5) i(-i) 25 5i 5i i2
25 10i 1 24 10i
23.
(-1)(-1)(9) 9
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43. i11
i10 i -1(i) -i
44. (2i)10 (2)10 i10
1,024(-1) -1,024