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anonymous

  • one year ago

Consider the function f(x) = x2 + 3x − 7. Find the value of f(x) when x = 3 and select the correct answer below. A. 5 B. 8 C. 11 D. 18

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  1. anonymous
    • one year ago
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    Please help with this, I don't understand

  2. jim_thompson5910
    • one year ago
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    everywhere you see an 'x' replace it with 3 (since x = 3) \[\Large f(x) = x^2 + 3x - 7\] \[\Large f(\color{red}{x}) = (\color{red}{x})^2 + 3(\color{red}{x}) - 7\] \[\Large f(\color{red}{3}) = (\color{red}{3})^2 + 3(\color{red}{3}) - 7\]

  3. jim_thompson5910
    • one year ago
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    now either use pencil/paper or a calculator to evaluate \(\Large (3)^2+3(3)-7\)

  4. anonymous
    • one year ago
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    Thank you but I still don't know how to evaluate it afterwards, my math is a little rusty

  5. jim_thompson5910
    • one year ago
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    you can use pencil/paper or you can use a calculator http://web2.0calc.com/

  6. jim_thompson5910
    • one year ago
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    two things to keep in mind 1) type `^` to mean exponent example: 9 squared = 9^2 2) something like `3(3)` means `3 times 3`. The number next to the parenthesis implies multiplication

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