Answer:
solution,
[tex]f(x) = - {x}^{2} - 3x \\ f( - 10) = {-(10)}^{2} - 3 \times 10 \\ \: \: \: \: \: \: \: \: \: = -100 - 30 \\ \: \: \: \: \: = -130[/tex]
hope this helps...
Good luck on your assignment..
-130
Step-by-step explanation:
f(x) = -x^2 -3x
Let x= 10
f(10) = -(10)^2 -3*10
= -100 -30
= -130
