Q. 1 C5.0( 2 Votes )

# Compute the following in head:

(3.6)^{2} – (1.4)^{2}

Answer :

using identity - =

(3.6)^{2} – (1.4)^{2} = (3.6+1.4) (3.6 - 1.4)

= (5) (2.2)

= 11

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