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Answer :
Let's solve the problem step-by-step:
We're given the function [tex]\( f(x) = 3x^2 + 2x - 1 \)[/tex] and we need to find the value of [tex]\( f(5) \)[/tex].
1. Substitute 5 for [tex]\( x \)[/tex] in the function:
First, replace every [tex]\( x \)[/tex] in the expression with 5.
2. Calculate [tex]\((5)^2\)[/tex]:
[tex]\((5)^2 = 25\)[/tex].
3. Multiply 3 by the result from step 2:
[tex]\(3 \times 25 = 75\)[/tex].
4. Multiply 2 by 5:
[tex]\(2 \times 5 = 10\)[/tex].
5. Add the results from steps 3 and 4, and then subtract 1:
[tex]\(75 + 10 - 1 = 84\)[/tex].
So, the value of [tex]\( f(5) \)[/tex] is 84. Therefore, the correct answer is B. 84.
We're given the function [tex]\( f(x) = 3x^2 + 2x - 1 \)[/tex] and we need to find the value of [tex]\( f(5) \)[/tex].
1. Substitute 5 for [tex]\( x \)[/tex] in the function:
First, replace every [tex]\( x \)[/tex] in the expression with 5.
2. Calculate [tex]\((5)^2\)[/tex]:
[tex]\((5)^2 = 25\)[/tex].
3. Multiply 3 by the result from step 2:
[tex]\(3 \times 25 = 75\)[/tex].
4. Multiply 2 by 5:
[tex]\(2 \times 5 = 10\)[/tex].
5. Add the results from steps 3 and 4, and then subtract 1:
[tex]\(75 + 10 - 1 = 84\)[/tex].
So, the value of [tex]\( f(5) \)[/tex] is 84. Therefore, the correct answer is B. 84.
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