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Byju's Answer
Standard VII
Mathematics
Simplifying Polynomial by cancelling out Terms using Subtraction
What is the p...
Question
What is the perimeter of above triangle?
A
(
x
4
+
3
x
3
+
2
x
2
+
4
)
units
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B
(
x
4
+
2
x
2
+
4
)
units
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C
(
x
4
+
3
x
3
+
2
x
2
+
4
)
units
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D
(
x
4
+
3
x
3
+
2
x
2
+
2
)
units
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Solution
The correct option is
A
(
x
4
+
3
x
3
+
2
x
2
+
4
)
units
As given in the hint, the perimeter of a triangle is equal to the sum of the lengths of all its sides.
⇒
Perimeter
=
(
3
x
4
−
5
x
2
+
2
)
+
(
3
x
3
+
6
x
2
−
4
)
+
(
−
2
x
4
+
x
2
+
6
)
Combining the like terms
=
(
3
x
4
−
2
x
4
)
+
3
x
3
+
(
−
5
x
2
+
6
x
2
+
x
2
)
+
(
2
−
4
+
6
)
=
x
4
+
3
x
3
+
2
x
2
+
4
Therefore, perimeter of the given triangle is
(
x
4
+
3
x
3
+
2
x
2
+
4
)
–
––––––––––––––––––––
–
units.
Hence, option (a.) is the correct choice.
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