Answer:
The value of the expression is 12 ⇒ B
Step-by-step explanation:
Let us solve the question
∵ The expression is 2n(n - 1)
→ Simplify it at first by multiply 2n by the bracket (n - 1)
∵ 2n(n - 1) = 2n(n) - 2n(1)
∴ 2n(n - 1) = 2n² - 2n
∵ n = 3
→ Substitute n by 3 in the expression to find its value
∴ 2n² - 2n = 2(3)² - 2(3)
∴ 2n² - 2n = 2(9) - 6
∴ 2n² - 2n = 18 - 6
∴ 2n² - 2n = 12 ⇒ at n = 3
∴ The value of the expression is 12
