question_answer 1)

If \[m=2,\] find the value of: (i) \[m-2\]                           (ii) \[3m-5\]                        (iii) \[9-5m\]                       (iv) \[3{{m}^{2}}-2m-7\] (v) \[\frac{5m}{2}-4\]

Answer:

                (i) \[m-2=2-2=0\].                 (ii) \[3m-5=3\times 2-5=6-5=1.\]                 (iii) \[9-5m=9-5\times 2=9-10=-1\]                 (iv) \[3{{m}^{2}}-2m-7=3{{(2)}^{2}}-2(2)-7\]                 \[=12-4-7=1\]                 (v) \[\frac{5m}{2}-4=\frac{5\times 2}{2}-4=5-4=1\].