Question

find the square of 84 without actual multiplication​

Answer 1

Answer:

The answer is 6416

As:

80*80=6400

4*4=16

THEREFORE

6400+16=6416

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Answer 2

Answer:

first of all we split the number

84 in two factors

In this way -

80 + 4

we have to find square of this term

= (80 + 4)^2

this is in the form of ( a + b ) ^2

as we know that

= (a + b )^2= a^2 +b^2 + 2ab

= (80 + 4 )^2

= (80)^2 + (4)^2 + 2×80×4

= 6400+ 16 + 640

= 7056

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