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Mathematics 11 Online
OpenStudy (anonymous):

f(x)=4x^2-x find f(-3)

zepdrix (zepdrix):

\[\Large f(\color{#CC0033}{x})\quad=\quad4(\color{#CC0033}{x})^2-(\color{#CC0033}{x})\]So plugging in -3 for each x will give us:\[\Large f(\color{#CC0033}{-3})\quad=\quad4(\color{#CC0033}{-3})^2-(\color{#CC0033}{-3})\]

zepdrix (zepdrix):

Do you understand how to simplify that? Start with the exponent, (-3)^2 = ?

OpenStudy (anonymous):

no

OpenStudy (anonymous):

33

OpenStudy (anonymous):

find the solution by substituting x with -3

zepdrix (zepdrix):

\[\Large -3\cdot-3\quad=\quad ?\]

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