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Q.

What is the value of (a3 - 2a2 + 4a - 5) - ( - a3 - 8a + 2a2 + 5) ?

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a

2a3-4a2+12a-10

b

2a3-4a2+12a+10

c

2a3-4a2-10

d

2a3-4a2+12a-11

answer is A.

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Detailed Solution

 Given:  (a3 - 2a2 + 4a - 5) - ( - a3 - 8a + 2a2 + 5)

= a3 + a3 - 2a2 - 2a2 + 4a + 8a - 5 - 5

= 2a3 - 4a2 + 12a - 10

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