evaluate using expansion (405)^2
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Answer:
164025
Step-by-step explanation:
405²
= (400+5)²
It is the form of (a+b)², where a=400, b=5
Applying the formula (a+b)² = a² + b² +2ab
(405)² = 400² + 5² +2 × 400 × 5 = 160000 + 25 + 4000 = 164025
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