Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$-12+9$$

Answer

-3

Solution


Reorder the terms.
\[9-12\]
Use this rule: \(a-b=-(b-a)\).
\[-(12-9)\]
Use the algorithm method.
012
12
-9
3
After simplification, we have:
\[-(12-9)=-3\]
Therefore, \(-12+9=-3\).
\[-3\]
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