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Find f(-2), given f(x)=3x^2-5?
im confused what the f(-2) means. I tried solving it by plugging in the -2 into the x values and i got the answer -41 but im not sure if i'm right or not.
my teacher gave me this study guide and this is one part of it that she hasnt even taught us 😂😭
3 Answers
- lenpol7Lv 72 months ago
You are correct in substituting in the '-2'
However, when squaring up '(-2)^2 = (+)4
Hence
f(-2) = 3(-2)^2 -5 =>
f(-2) = 3(4) - 5 =>
f(-2) = 12 - 5
f(-2) = 7
- MichaelLv 72 months ago
f(x) = 3x² - 5
substitute -2 for x
f(-2) = 3(-2)² - 5
f(-2) = 3(4) - 5
f(-2) = 12 - 5
f(-2) = 7 <–––––––
