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# Use a suitable identity to get each of the following products. (1.1m - 4) (1.1m +4)

Q : 1   Use a suitable identity to get each of the following products in bracket.

(v) $(1.1m - 4)(1.1m+4)$

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$(1.1m - 4)(1.1m+4)$
We use identity III for this which is
(a - b)(a + b) =  $a^{2} - b^{2}$
In this a = 1.1m  and b = 4
$(1.1m - 4)(1.1m+4)$ =  $(1.1m)^{2} - (4)^{2}$
=  1.21$m^{2}$ - 16

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