the square of the following number 81
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Verified answer
Answer:
=6,516
Step-by-step explanation:
=(81)
=81×81
=6,516
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★ Answer :
→ Method 1 :
As we have to find the square of 81. So, we will multiply 81 by 81.
→ (81)² = 81 * 81
→ 6561
[tex]\rule{200}{2}[/tex]
→ Method 2 :
We can write 81 as (80 + 1)
→ (80 + 1)²
We know that,
(a + b)² = a² + b² + 2ab
→ 80² + 1² + 2(80)(1)
→ 6400 + 1 + 160
→ 6560 + 1
→ 6561