Question

the square of the following number 81​

Answer 1

Answer:

=6,516

Step-by-step explanation:

=(81)

=81×81

=6,516

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Answer 2

★ Answer :

→ Method 1 :

As we have to find the square of 81. So, we will multiply 81 by 81.

→ (81)² = 81 * 81

→ 6561

$\rule{200}{2}$

→ 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