a = 2x-3 এবং b = 2x+5 হলে, a2 এর মান কত?

A 4x+12

B 4x2-12x+9

C 4x+12x

D 4x2+12x+9

Solution

Correct Answer: Option B

দেওয়া আছে, a = 2x-3
∴ a2 = (2x-3)2
=(2x)2-2.2x.3+(3)2
=4x2-12x+9

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