Question

9. Without actually squaring, find the value of the following
a) 21^2 - 20^2
b) 34^2-33^2
c) 95^2-94^2​

Answer 1

Step-by-step explanation:

Using the formula, a2−b2=(a+b)(a−b)

We get, 362−352=(36+35)(36−35)

=71×1

=71.

Answer 2

Step-by-step explanation:

Answer

Correct option is

B

71

Using the formula, a

2

−b

2

=(a+b)(a−b)

We get, 36

2

−35

2

=(36+35)(36−35)

=71×1

=71.

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