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If $m=2$, find the value of:
$(i)$. $m-2$
$(ii)$. $3m-5$
$(iii)$. $9-5m$
$(iv)$. $3m^2-2m-7$
$(v)$. $\frac{5m}{2}-4$
Given:
$(i)$. $m-2$
$(ii)$. $3m-5$
$(iii)$. $9-5m$
$(iv)$. $3m^2-2m-7$
$(v)$. $\frac{5m}{2}-4$
To do: To find the value of given expressions if $m=2$.
Solution:
$(i)$. $m-2$
Putting $m=2$
$=2-2$
$=0$
$(ii)$. $3m-5$
Putting $m=2$
$=3(2)-5$
$=6-5$
$=1$
$(iii)$. $9-5m$
Putting $m=2$
$=9-5(2)$
$=9-10$
$=-1$
$(iv)$. $3m^2-2m-7$
Putting $m=2$
$=3(2)^2-2(2)-7$
$=12-4-7$
$=1$
$(v)$. $\frac{5m}{2}-4$
Putting $m=2$
$=\frac{5(2)}{2}-4$
$=5-4$
$=1$
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