Question

without actually squaring find the value of 21²-20²​

Answer 1

• 41 is the required value for 21² - 20²

Step-by-step explanation:

Given:

• 21² - 20²

To find:

• The value of 21² - 20² without squaring it.

Algebraic Identity used:

• (a² - b²) = (a + b) (a - b)

Finding the value of 21² - 20²:

➙ (21² - 20²)

➙ (21 + 20) (21 - 20)

➙ (41) × (1)

➙ 41

Conclusion:

• Hence, the value of (21² - 20²) is 41.

Answer 2

Answer:

Step-by-step explanation: