Use a suitable identity to get each of the following products:
(1.1m – 0.4 ) (1.1m + 0.4 ).

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Solution

$(1.1 m - 0.4) (1.1 m + 0.4)$
$= (1.1 m)^{2} - (0.4)^{2}$ (1 mark) $(U s i n g t h e i d e n t i t y (a - b) (a + b) = a^{2} - b^{2}]$
$= 1.21 m^{2} - 0.16$ (1 mark).

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