F(x) = 7 - 5x + 7x2 find f(-9)

Mathematics

2 answers:

Law Incorporation [45]3 years ago

7 0

Answer:

Step-by-step explanation:

F(x) = 7 - 5x + 7x²

f(-9) = 7 - 5*(-9) + 7*(-9)²

= 7 + 45 + 7*81

= 7 + 45 + 567

= 619

blondinia [14]3 years ago

4 0

Answer:

f(-9) = 619

Step-by-step explanation:

To solve for f(-9), plug -9 in for x in the equation of f(x). In other words, change all x's into -9 in the equation 7 - 5x + 7x² and then solve.

f(x) = 7 - 5x + 7x²

Plug in -9 for x.

f(-9) = 7 - 5(-9) + 7(-9)²

Simplify. 5(-9) = -45, 7(-9)² = 7(81) = 567

f(-9) = 7 + 45 + 567

Solve.

f(-9) = 619

The answer is 619.

I hope this helps. If you need clarifications of anything, feel free to ask. Happy studying. :)

You might be interested in

Please help!!! Thanks

salantis [7]

Answer:

Option 2

Step-by-step explanation:

it easy Add them all up and then you get 47/16 then divide them and convert it to mixed number and then you get 2 15/16

8 0

3 years ago

Read 2 more answers

Because Bernard has some health issues, he must pay 15% more for life insurance. About how much more annually will a $115,000 10

olga2289 [7]

From the given table, the annual premium rate as a percentage of value insured a person at age 35 has to pay is 0.14%.

The amount more annually a $115,000 10-year term insurance at age 35 cost Bernard than someone of the same age without health issues is option d. $24

Reasons:

The data in the table are presented as follows;

$\begin{tabular}{|c|c|c|}Age&Annual Insurance Premiums (per \$1,000 of face value)&\\&10-Year Term &\\&Male&Female\\35&1.40&1.36\\40&1.64&1.59\\45&2.07&2.01\end{array}\right]$