Answer:
Step by step solution : Step 1 :Trying to factor by splitting the middle term. 1.1 Factoring x2-5x-24
Step-by-step explanation:
Answer:-21
Step-by-step explanation:f(x)=−x
2
+5x+15
Find
f
(
9
)
Find f(9)
−
(
9
)
2
+
5
(
9
)
+
15
−(9)
2
+5(9)+15
Plug into each x-value
−
(
81
)
+
5
(
9
)
+
15
−(81)+5(9)+15
Square first
−
81
+
45
+
15
−81+45+15
Multiply and negate
f
(
9
)
=
−
21
f(9)=−21
