Answer :

m is a whole number less than 5 Whole numbers less than 5 are 0, 1, 2, 3 and 4 hence m can take values 0, 1, 2, 3 and 4


When m = 0:


2m – 5 = 2 × 0 – 5 = -5


When m = 1:


2m – 5 = 2 × 1 – 5 = 2 – 5 = -3


When m = 2:


2m – 5 = 2 × 2 – 5 = 4 – 5 = -1


When m = 3:


2m – 5 = 2 × 3 – 5 = 6 – 5 = 1


When m = 4:


2m – 5 = 2 × 4 – 5 = 8 – 5 = 3


The table becomes



By looking at table the equation 2m – 5 = – 1 holds true when m = 2 hence solution of equation 2m – 5 = – 1 is m = 2


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