1. Distribute
7i × 5 + 7i × -9i
2. Simplify 7i × 5 to 35i
35i + 7i × -9i
3. Simplify 7i × -9i to -63ii
35i - 63ii
4. Use the Product Rule
35i - 63i^2
5. Use the Square Rule
35i - 63 × -1
6. Simplify 63 × -1 to -63
35i - (-63)
7. Simplify brackets
35i + 63
8. Regroup terms
63 + 35i
You find the lcm by finding the prime factors of each number, then combine these prime factors with leaving out the duplicates:
14 = 2x7
7 = 7
4 = 2x2
2 = 2
lcm = 2x7x2 = 28
(7, 2 and 2 are duplicates)
Answer:
54
Step-by-step explanation:
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