Question

- Knowledge Check 3.2
1. Without actual multiplication, find the square of the following numbers:
(i) 57
(ii) 73
(iii) 81
​

Answer 1

Answer:

3249

5329

6560

Step-by-step explanation:

Formulae used : (a+b)² = a²+b²+2ab

• (57)²
• (50+7)²
• (2500+49+700)
• 3249

• (73)²
• (70+3)²
• (4900+9+420)
• 5329

• (81)²
• (80+1)²
• (6400+1+160)
• 6560