a = 2, b=3 হলে, 2a+4b এর সাথে 2a2 + a - b যোগ করলে যোগফল কত হবে ?

A 15

B 17

C 19

D 23

Solution

Correct Answer: Option D

2a + 4b + 2a2 + a -b 
= 3a + 3b + 2a2 
= 3.2 + 3.3 + 2.22 [ a=2, b=3 ]
= 6 + 9 + 8
= 23

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