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

AcademicMathematicsNCERTClass 7

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 $m=2$


$=\frac{5(2)}{2}-4$


$=5-4$


$=1$

raja
Updated on 10-Oct-2022 13:38:20

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