Answer:
f(5) = 112
Step-by-step explanation:
[tex]f(x)=3x^2+9x-8\\f(5)=3(5)^2+9(5)-8\\f(5)=3(25)+45-8\\f(5)=75+45-8\\f(5)=120-8\\f(5)=112[/tex]
-38
To find the answer to this question, you must simply plug in 5 for x
f(5) = -3*5^2+9*5-8
f(5) = -3*25+9*5-8
f(5) = -75+9*5-8
f(5) = -75+45-8
f(5) = -38
Therefore, the answer is -38
