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Question
From the formula B = 2a2 – b2, calculate the value of B when a = 3 and b = − 1.
Solution
B = 2a2 – b2
Put the values of a = 3 and b = − 1 in above equation
B = 2 × (3)2 – (− 1)2
B = 18 – 1
B = 17
Value of B is = 17
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