Use suitable identity to solve $(1.1 m - 0.4) (1.1 m + 0.4)$

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Solution

Given: $(1.1 m - 0.4) (1.1 m + 0.4)$
Lets use the identity $(a + b) (a - b) = a^{2} - b^{2}$
$(1.1 m - 0.4) (1.1 m + 0.4) = (1.1 m)^{2} - (0.4)^{2}$
$(1.1 m - 0.4) (1.1 m + 0.4) = 1.21 m^{2} - 0.16$

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