Given ~
[tex]\tt \: f(x) = \frac{ {x}^{2} - 4x }{20} [/tex]
[tex] \: [/tex]
put the value of x = 6 in given function ~
[tex]\tt \: f(6) = \frac{ {(6)}^{2} - 4(6) }{20} [/tex]
[tex] \: [/tex]
[tex] \tt \: f(6) = \frac{ 36 - 24 }{20} [/tex]
[tex] \: [/tex]
[tex]\tt \: f (6)= \frac{ \: 12 \: }{20} [/tex]
[tex] \: [/tex]
divide the function by 4 ~
[tex]\tt \: f (6)= \cancel{ \frac {12 }{20} }[/tex]
[tex] \: [/tex]
[tex] \underline{ \boxed{ \red{\tt \: f (6)= \frac {3 }{5} }}}{ \green \: }[/tex]
[tex] \: [/tex]
hope helps ~
