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If [tex]$f(x) = -2x^2 + 2x - 3$[/tex], what is [tex]$f(5)$[/tex]?

A. [tex]-93[/tex]
B. [tex]-43[/tex]
C. [tex]-28[/tex]
D. [tex]87[/tex]


Sagot :

To find the value of [tex]\( f(5) \)[/tex] when [tex]\( f(x) = -2x^2 + 2x - 3 \)[/tex], follow these steps:

1. Substitute [tex]\( x = 5 \)[/tex] into the function [tex]\( f(x) \)[/tex]:
[tex]\[ f(5) = -2(5)^2 + 2(5) - 3 \][/tex]

2. Calculate the value inside the parentheses. First, determine [tex]\( 5^2 \)[/tex]:
[tex]\[ 5^2 = 25 \][/tex]

3. Multiply [tex]\( -2 \)[/tex] by [tex]\( 25 \)[/tex]:
[tex]\[ -2 \times 25 = -50 \][/tex]

4. Next, multiply [tex]\( 2 \)[/tex] by [tex]\( 5 \)[/tex]:
[tex]\[ 2 \times 5 = 10 \][/tex]

5. Combine the results from steps 2, 3, and 4:
[tex]\[ f(5) = -50 + 10 - 3 \][/tex]

6. Perform the addition and subtraction in order:
[tex]\[ -50 + 10 = -40 \][/tex]
[tex]\[ -40 - 3 = -43 \][/tex]

So, the value of [tex]\( f(5) \)[/tex] is:
[tex]\[ f(5) = -43 \][/tex]

Thus, the correct answer is:
[tex]\[ -43 \][/tex]