Answer:
The answer is -114.
Step-by-step explanation:
You have to substitute x = 6 into the function :
[tex]f(x) = - 4 {x}^{2} +5 x[/tex]
[tex]f( 6) = - 4 {(6)}^{2} + 5(6)[/tex]
[tex]f(6) = - 4(36) + 30[/tex]
[tex]f(6) = - 144 + 30[/tex]
[tex]f(6) = - 114[/tex]
