# For F(x) = -4x how do you find f(a-1)?

$F \left(a - 1\right) = - 4 a + 4$
$F \left(x\right) = - 4 x$ given function
$F \left(a - 1\right) = - 4 \left(a - 1\right)$ plug in values of x
$F \left(a - 1\right) = - 4 a + 4$ simplify by distributing