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Question

From the sum of z3+3z2+5z+8 and 4z3+2z2−7z−2 subtract 2z3−3z2+z−4.

A
0
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B
8z23z
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C
3z3+8z23z+10
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D
2z
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Solution

The correct option is C 3z3+8z23z+10
The sum of z3+3z2+5z+8 and 4z3+2z27z2 is,
=z3+3z2+5z+8+4z3+2z27z2
=5z3+5z22z+6
Now,
Subtracting 2z33z2+z4 from =5z3+5z22z+6 we get,
5z3+5z22z+6
2z33z2+z4
- + - +
3z3+8z23z+10

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