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Question

If $$m=2$$, find the value of:
$$m - 2, \ 3m-5, \ 9-5m$$, $$3{ m }^{ 2 }-2m-7$$ , $$\dfrac { 5m }{ 2 } -4$$


Solution

$$m=2$$

1. $$m-2=0$$

2. $$3m-5=3\times 2-5=1$$

3. $$9-5m=-1$$

4. $$3m^2-2m-7=12-4-1$$ $$=7$$

5. $$\dfrac{5m}{2}-4=1$$.

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