10v^3 -18v^2 +12v
This is because you have to change the sign of the second polynomial due to the negative sign. Then you can add.
Answer:
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Step-by-step explanation:
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Blue ink are equations used to solving the problems.
C/4=168
C=168*4 (both sides by 4)
C=672
3x-y=2....(i)
2x-y=3.....(ii)
now adding the eqn I and ii ,
3x-y=2
2x-y=3
+ + +
5x=5
x=1
Now substituting the value of x in eqn I
3×1-y=2
3-y=2
-y=-1
y=1