If #f(x) = 3x^2 - x#, how do you find f(-2)?

Answer 1

To find ( f(-2) ), you substitute -2 for ( x ) in the function ( f(x) = 3x^2 - x ). So, ( f(-2) = 3(-2)^2 - (-2) = 3(4) + 2 = 12 + 2 = 14 ). Therefore, ( f(-2) = 14 ).

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Answer 2

Eva Abramson

#f(-2)=14#

#"substitute " x = - 2" into "f(x)#

#f(color(red)(-2))=(3xxcolor(red)((-2)^2))-(color(red)(-2))#

#color(white)(xxxx)=(3xx4)+2=12+2=14#

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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