The value of the expression 3b² - b when b = 5 is 70
From the question, the given expression is 3b2−b.
This can be written properly as 3b² - b.
Now to determine the value of 3b² - b when b = 5. That means, we should substitute the value 5 for b in the given expression.
Now, putting b = 5 in the expression, we get
\(3b^{2}-b = 3(5)^{2}-5\)
\(= 3 \times (5)^{2} - 5\)
Then,
\(3b^{2}-b = 3 \times 25-5\)
(NOTE: \(5^{2} = 5 \times 5 = 25\))
∴ \(3b^{2}-b = 75-5\)
(NOTE: Multiplication(M) comes before subtraction (S) in BODMAS, so you multiply before subtracting)
∴ \(3b^{2}-b = 70\)
Therefore the value of the expression 3b² - b when b = 5 is 70
Hence, the value of the expression 3b² - b when b = 5 is 70
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